sdp200

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Frage 1 von 200

1. What will be the output of the program?

Wähle eine der folgenden:

o Pine
o Oak
o Tree
o Forest
o Oops

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Frage 2 von 200

2. Select how you would run your program to cause it to print: Arg is 2

Wähle eine der folgenden:

o java Myfile 2 2 2
o java Myfile 1 2 2 3 4
o java Myfile 1 3 2 2
o java MyFile 1 2 2 2
o java Myfile 0 1 2 3

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Frage 3 von 200

3. [html]What does the following code do? void blur(char[] z, String st) { if(z.length < st.length()) retrun; for(int i = 0; i < st.length(); i++) z[i] = st.charAt(i); }

Wähle eine der folgenden:

o It determines if the array contains the same characters as the String
o It copies characters from the array to the String
o It copies characters from the String to the array;
o It creates a new array that contains the same characters as the String

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Frage 4 von 200

4. Given the declaration of an array : int[] a = {1,2,3,4,5}; What is the value of a[4]?

Wähle eine der folgenden:

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Frage 5 von 200

5. An array holds:

Wähle eine der folgenden:

o Similar values of same data type
o Different values of same data type
o Same values of different data types
o Different values of different data types

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Frage 6 von 200

6. [html]Java uses call by value. What is the value that is being passed into the routine by the method call in the following? double rats[] = {1.2 , 2.3, 3.4}; routine(rats);

Wähle eine der folgenden:

o A copy of the array rats
o The value of the elements of rats
o A reference of the array
o 1.2
o 2.3

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Frage 7 von 200

7. What is the prototype of the default constructor?

Wähle eine der folgenden:

o Test()
o Test
o public Test()
o public Test(void)
o Test(void)

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Frage 8 von 200

8. What is the widest valid returnType for methodA in line 3?

Wähle eine der folgenden:

o int
o long
o byte
o double
o void

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Frage 9 von 200

9. You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

Wähle eine der folgenden:

o java.util.Map
o java.util.Set
o java.util.Tree
o java.util.List
o java.util.Collection

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Frage 10 von 200

10. You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

Wähle eine der folgenden:

o public
o private
o protected
o transient
o volatile

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Frage 11 von 200

11. Let’s assume that you have class C and interface I ? Which of the following is correct statement?

Wähle eine der folgenden:

o class C implements I
o class C extends I
o interface I extends C
o interface I implements C
o class I implements C

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Frage 12 von 200

12. Which is valid in a class that extends class A?

Wähle eine der folgenden:

o public int method1(int a, int b) {return 0; }
o private int method1(int a, int b) {return 0; }
o protected static int method1(int a, int b) {return 0; }
o public long method1(int a, int b) {return 0; }
o public static int method1(int a, int b) {return 0; }

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Frage 13 von 200

13. Which statement is true?

Wähle eine der folgenden:

o catch(X x) can catch subclasses of X where X is a subclass of Exception.
o The Error class is a RuntimeException.
o Any statement that can throw an Error must be enclosed in a try block
o Any statement that can throw an Exception must be enclosed in a try block

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Frage 14 von 200

14. What will be the output of the program?

Wähle eine der folgenden:

o one two three four
o one two three four one
o four three two one
o four one three two

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Frage 15 von 200

15. Given a method in a class, what access modifier do you use to restrict access to that method to only the other members of the same class?

Wähle eine der folgenden:

o final
o public
o private
o protected
o static
o volatile

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Frage 16 von 200

16. [html] Which three statements are true? 1. The default constructor initialises method variables. 2. The default constructor has the same access as its class. 3. The default constructor invokes the no-arg constructor of the superclass. 4. If a class lacks a no-arg constructor, the compiler always creates a default constructor. 5. The compiler creates a default constructor only when there are no other constructors for the class.

Wähle eine der folgenden:

o 1,2,4
o 2,3,5
o 3,4,5
o 1,2,3
o 1,3,5

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Frage 17 von 200

17. What will be the output of the program?

Wähle eine der folgenden:

o AC
o ACD
o BD
o ABCD
o ABD

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Frage 18 von 200

18. What will be the output of the program after the running program in such way :/> java Test red green blue?

Wähle eine der folgenden:

o baz =
o baz = blue
o baz = null
o Runtime Exception
o Compilation Error

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Frage 19 von 200

19. Which is a valid declaration within an interface?

Wähle eine der folgenden:

o public static final short stop = 23;
o protected short stop = 23;
o transient short stop = 23;
o final void madness(short stop);
o void madness(short stop) = 0;

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Frage 20 von 200

20. Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

Wähle eine der folgenden:

o java.util.HashSet
o java.util.LinkedList
o java.util.ArrayList
o java.util.List
o java.util.TreeSet

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Frage 21 von 200

21. Which interface provides the capability to store objects using a key-value pair?

Wähle eine der folgenden:

o java.util.Map
o java.util.Set
o java.util.List
o java.util.Collection
o java.util.ArrayList

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Frage 22 von 200

22. [html]Which of the following statements about the hashcode() method are incorrect? 1.The value returned by hashcode() is used in some collection classes to help locate objects 2. The hashcode() method is required to return a positive int value 3. The hashcode() method in the String class is the one inherited from Object 4. Two new empty String objects will produce identical hashcodes

Wähle eine der folgenden:

o 1 and 2
o 2 and 3
o 3 and 4
o 1 and 4
o 2 and 4

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Frage 23 von 200

23. Which class or interface defines the wait(), notify(),and notifyAll() methods?

Wähle eine der folgenden:

o Object
o Thread
o Runnable
o Class

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Frage 24 von 200

24. What will be the output of the program?

Wähle eine der folgenden:

o It will print the numbers from 0 to 19 sequentially
o It will print the numbers from 1 to 20 sequentially
o It will print the numbers from 0 to 19 but the order is not determined
o It will print the numbers from 1 to 20 but the order is not determined
o It will print the numbers from 0 to 9 two times, but the order is not determined

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Frage 25 von 200

25. [html]Which two can be used to create a new Thread? 1. Extend java.lang.Thread and override the run() method 2. Extend java.lang.Runnable and override the start() method 3. Implement java.lang.Thread and implement the run() method 4. Implement java.lang.Runnable and implement the run() method 5. Implement java.lang.Thread and implement the start() method

Wähle eine der folgenden:

o 1 and 2
o 2 and 3
o 3 and 4
o 4 and 5
o 1 and 4
o 2 and 5

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Frage 26 von 200

26. The following block of code creates a Thread using a Runnable target: 
br> Which of the following classes can be used to create the target, so that the preceding code compiles correctly?

Wähle eine der folgenden:

o public class MyRunnable extends Runnable{public void run(){}}
o public class MyRunnable extends Object{public void run(){}}
o public class MyRunnable implements Runnable{public void run(){}}
o public class MyRunnable implements Runnable{void run(){}}
o public class MyRunnable implements Thread{void run(){}}

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Frage 27 von 200

27. What will be the output of the program?

Wähle eine der folgenden:

o AB
o BC
o BCD
o ABC
o ACD

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Frage 28 von 200

28. Which interface does the java.util.Hashtable implement?

Wähle eine der folgenden:

o java.util.Map
o java.util.Set
o java.util.Collection
o java.util.List
o java.util.HashTable

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Frage 29 von 200

29. Which of these will create and start this thread?

Wähle eine der folgenden:

o new Runnable(MyRunnable).start();
o new Thread(MyRunnable).run();
o new Thread(new MyRunnable()).start();
o new MyRunnable().start();
o new Runnable(MyRunnable).run();

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Frage 30 von 200

30. The number of characters in an object of a class String is given by

Wähle eine der folgenden:

o The member variable called size
o The member variable called length
o The method size() returns the number of characters
o The method length() returns the number of characters

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Frage 31 von 200

31. Which of the following statements is correct?

Wähle eine der folgenden:

o An import statement, if defined, must be the non-comment statement of the file
o Private members are accessible to all classes in the same package
o An abstract class can be declared as final
o Local variables cannot be declared as static

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Frage 32 von 200

32. Which code determines the int value data closer to, but not greater than, a double value b?

Wähle eine der folgenden:

o int data = (int)Math.ceil(b)
o int data = (int)Math.floor(b)
o int data = (int)Math.abs(b)
o int data = (int)Math.min(b)

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Frage 33 von 200

33. Which statement is true for the Class java.util.HashSet?

Wähle eine der folgenden:

o The elements in the collection are unique
o The elements in the collection are ordered
o The elements in the collection are synchronized
o The collection is guaranteed to be immutable

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Frage 34 von 200

34. [html]What will be the output of the program? class Exc0 extends Exception{} class Exc1 extends Exc0 {} // Line 2 public class Test { public static void main(String args[]) { try { throw new Exc1(); //Line 9 } catch (Exc0 e0) { System.out.println(“Ex0 caught”); } catch(Exception e) { System.out.println(“Exception caught”); } } }

Wähle eine der folgenden:

o Ex0 caught
o Exception caught
o Compilation fails because of an error at line 2
o Ex0 caught Exception caught

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Frage 35 von 200

35. Which of the following is not a part of OOP?

Wähle eine der folgenden:

o Type checking
o Multitasking
o Polymorphism
o Information hiding

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Frage 36 von 200

36. Static methods cannot be accessed directly from the class level

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 37 von 200

37. The process by which one object can acquire the properties of another object

Wähle eine der folgenden:

o Encapsulation
o Inheritance
o Polymorphism

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Frage 38 von 200

38. Constructors are used to

Wähle eine der folgenden:

o Build a user interface
o Free memory
o Initialize a newly created object
o To create a sub class

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Frage 39 von 200

39. What happens in a method if an exception is thrown in a try{} block and there is NO MATCHING catch{} block?

Wähle eine der folgenden:

o This is not legal, so the program will not compile
o The method throws the exception to its caller, exactly if there were no try{} block
o The program halts immediately
o The program ignores the exception

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Frage 40 von 200

40. Is a program required to catch all exceptions that might happen?

Wähle eine der folgenden:

o No. You can write a program to catch just the exceptions you want
o No. But if a program catches one type of exception it must catch all other types as well
o Yes. If a program is not written to catch all exceptions it will not compile
o Yes. A program can not do I/O unless it catches all exceptions

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Frage 41 von 200

41. What method of an Exception object returns a message string?

Wähle eine der folgenden:

o getError()
o getMessage()
o printMessage()
o traceMessage()

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Frage 42 von 200

42. What happens during execution if a negative value is used for an array index?

Wähle eine der folgenden:

o An IndexOutOfBoundsException is thrown
o A NumberFormatException is thrown
o The first slot of the array is used
o This is an Error, so the program immediately terminates no matter what

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Frage 43 von 200

43. What method of an Exception object prints a list of methods that were called before the exception was throw?

Wähle eine der folgenden:

o printErrors()
o getMessage()
o traceStack()
o printStackTrace()

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Frage 44 von 200

44. A single sequence of code executing within a program is known as:

Wähle eine der folgenden:

o A method
o A process
o A thread

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Frage 45 von 200

45. To start the execution of a thread after you create it, you must:

Wähle eine der folgenden:

o Call the method run()
o Call the method start()
o Do nothing, threads start automatically upon creation
o Call the method notify()

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Frage 46 von 200

46. You designate a method as being synchronized by:

Wähle eine der folgenden:

o Using the keyword synchronized
o Naming the method synchronize
o Placing a synchronized section of code within it

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Frage 47 von 200

47. What method is declared in the Runnable interface and serves as the path of execution for all threads?

Wähle eine der folgenden:

o run()
o start()
o go()

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Frage 48 von 200

48. What is a buffer?

Wähle eine der folgenden:

o A section of memory used as a staging area for input or output data
o The cable that connects a data source to the bus
o Any stream that deals with character IO
o A file that contains binary data

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Frage 49 von 200

49. What happens if a FileWriter constructor is given an illegal file name?

Wähle eine der folgenden:

o The program bombs immediately
o The users disk is corrupted
o The constructor returns a null value
o An IOExcpetion is thrown

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Frage 50 von 200

50. When a file is opened for appending where does the write() put new text?

Wähle eine der folgenden:

o At the beginning of the file
o At the end of the file
o Where ever the user specifies
o Files cannot be appended to

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Frage 51 von 200

51. A null reference may be used to access a static variable or method

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 52 von 200

52. Set allows at most two null elements?

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 53 von 200

53. Which collection class allows you to access its elements by associating sorted element and provides an order?

Wähle eine der folgenden:

o java.util.TreeSet
o java.util.HashSet
o java.util.TreeMap
o java.util.Hashtable

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Frage 54 von 200

54. A class cannot define more than one constructor

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 55 von 200

55. If you were to store objects into an implementation of List which happens only once in the entire lifecycle of the product,but reading these objects inside the List implementation is quite high, then which one would you use?

Wähle eine der folgenden:

o Queue
o Stack
o ArrayList
o LinkedList

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Frage 56 von 200

56. In java one class can derive from one class?

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 57 von 200

57. Which of the following is not true for abstract classes?

Wähle eine der folgenden:

o Abstract class cannot to be instantiated
o Abstract class handlers can be used to handle derived class objects
o We can’t have an abstract class without abstract methods
o Abstract class has member elements

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Frage 58 von 200

58. Which of the following is not true for static keyword?

Wähle eine der folgenden:

o Static members are shared by all objects of the class
o We can override static methods
o Static methods operate only on static variables only
o Static elements are accessed using class name

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Frage 59 von 200

59. List is a/an …?

Wähle eine der folgenden:

o Class
o Interface
o Both
o Package

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Frage 60 von 200

60. Which exception is thrown by the read () method of InputStream class?

Wähle eine der folgenden:

o IOException
o FileNotFoundException
o ReadException
o AccessDeniedException

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Frage 61 von 200

61. Which is the Java keyword used to denote a class method?

Wähle eine der folgenden:

o class
o final
o private
o static

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Frage 62 von 200

62. What is Recursion in Java?

Wähle eine der folgenden:

o Recursion is a class
o Recursion is a process of defining a method that calls other methods repeatedly
o Recursion is a process of defining a method that calls itself repeatedly
o Recursion is a process of defining a method that calls other methods which in turn call again this method

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Frage 63 von 200

63. Which of these data types is used by operating system to manage the Recursion in Java?

Wähle eine der folgenden:

o Array
o Stack
o Queue
o Tree
o Map

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Frage 64 von 200

64. What will be an output?

Wähle eine der folgenden:

o true true
o true false
o false true
o false false
o Runtime error will occur

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Frage 65 von 200

65. What will be an output?

Wähle eine der folgenden:

o 24
o 30
o 120
o 720
o Compilation Error
o Runtime Error

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Frage 66 von 200

66. What will be an output?

Wähle eine der folgenden:

o 1
o 0
o 5
o 15
o Compilation Error
o Runtime Error

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Frage 67 von 200

67. What will be an output?

Wähle eine der folgenden:

o 1
o 0
o 12
o 78
o Compilation error
o Runtime error

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Frage 68 von 200

68. Deletion is faster in LinkedList than ArrayList

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 69 von 200

69. Can a top level class be private?

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 70 von 200

70. Which of the following is not a primitive data type?

Wähle eine der folgenden:

o Double
o int
o char
o boolean
o No right answer

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Frage 71 von 200

71. The term wrapper class refers to

Wähle eine der folgenden:

o A collection of java classes that used to make an object from primitive data types
o The java classes that contain at least two data fields
o The java classes that contain a reference to themselves
o A collection of java classes that contain other java classes

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Frage 72 von 200

72. What will be the output of the program?

Wähle eine der folgenden:

o Got the exception 10
o Got the exception e
o Compilation error
o Runtime error

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Frage 73 von 200

73. What will be the output of the program?

Wähle eine der folgenden:

o Got the Test Exception
o Inside finally block
o Got the Test Exception 
Inside finally block
o Compilation error

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Frage 74 von 200

74. What will be the output of the program?

Wähle eine der folgenden:

o Compilation error
o Compiles and runs fine
o Compiles fine but throws ArithmeticException at runtime

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Frage 75 von 200

75. What will be the output of the program?

Wähle eine der folgenden:

o Caught base class exception
o Caught derived class exception
o Caught base class exception Caught derived class exception
o Compilation error because derived is not throwable
o Compilation error because base class exception is caught before derived class

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Frage 76 von 200

76. What will be the output of the program?

Wähle eine der folgenden:

o Compilation error
o Divide by zero error
o inside the finally block
o a = 0
o a=0 Divide by zero block inside the finally block

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Frage 77 von 200

77. What will be the output of the program?

Wähle eine der folgenden:

o Compilation error
o Runtime error
o ArrayIndexOutOfBoundsException
o ErrorCode is printed
o Array is printed

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Frage 78 von 200

78. Which of the following is not true about interfaces in java?

Wähle eine der folgenden:

o An interface is similar to a class, but can contain following type of members. public, static, final fields(i.e., constants) default and static methods with bodies
o An instance of interface can be created
o A class can implement multiple interfaces
o Many classes can implement the same interface

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Frage 79 von 200

79. Which of the following is not true about inheritance in java?

Wähle eine der folgenden:

o Private methods are final
o Protected members are accessible within a package and inherited classes outside the package
o Protected methods are final
o We cannot override private methods

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Frage 80 von 200

80. Which of the following is true about inheritance in Java. 1) In Java all classes inherit from the Object class directly or indirectly. The Object class is root of all classes. 2) Multiple inheritance is not allowed in Java. 3) Inheritance is a part of polymorphism

Wähle eine der folgenden:

o 1,2 and 3
o 1 and 2
o 1 and 3
o 2 and 3
o Only 1
o Only 2
o Only 3

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Frage 81 von 200

81. What will be the output of the program?

Wähle eine der folgenden:

o Derived::show() called
o Base::show() called
o Compilation error
o Runtime error

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Frage 82 von 200

82. What will be the output of the program?

Wähle eine der folgenden:

o Derived::show() called
o Base::show() called
o Compilation error
o Runtime error

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Frage 83 von 200

83. What will be the output of the program?

Wähle eine der folgenden:

o Base
o Derived
o Compilation error
o Runtime error

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Frage 84 von 200

84. What will be the output of the program?

Wähle eine der folgenden:

o Compilation error in super.super.Print()
o Grandparent’s print Child’s Print()
o Grandparent’s print Parent’s Print Child’s Print()
o Runtime error

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Frage 85 von 200

85. What will be the output of the program?

Wähle eine der folgenden:

o Complex number is (10.0 + 15.0i)
o Compilation error
o Runtime error
o Complex number is Complex@8e2fb5 (where 8e2fb5 is hash code of c)

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Frage 86 von 200

86. What will be the output of the program?

Wähle eine der folgenden:

o 20
o 0
o Compilation error
o Runtime error

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Frage 87 von 200

87. What will be the output of the program?

Wähle eine der folgenden:

o s1 == s2 is: true
o s1 == s2 is: false
o true
o false
o compilation error
o runtime exception

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Frage 88 von 200

88. Which of the following is used by byte streams for input?

Wähle eine der folgenden:

o InputStream
o InputOutputStream
o BufferedReader
o Scanner
o System.in

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Frage 89 von 200

89. Which of these classes are used by character streams output operations?

Wähle eine der folgenden:

o InputStream
o ReadStream
o Writer
o OutputStream

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Frage 90 von 200

90. Which of the following is not a wrapper class?

Wähle eine der folgenden:

o Byte
o String
o Integer
o Character
o Double
o Long

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Frage 91 von 200

91. What restriction is there on using a super reference in a constructor?

Wähle eine der folgenden:

o Only one child class can use it
o It can only be used in parent class
o It must be used in the first statement of the constructor of subclass
o It must be used in the last statement of the constructor of subclass
o No right answer

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Frage 92 von 200

92. A method that is used to assign values to the instance variables of the class is called a

Wähle eine der folgenden:

o set method
o get method
o accessor
o constructor
o toString() method

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Frage 93 von 200

93. Which of the following is not a keyword for an exception handling?

Wähle eine der folgenden:

o try
o catch
o throw
o thrown
o finally

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Frage 94 von 200

94. Which of the following keywords is used to handle the exception by try block?

Wähle eine der folgenden:

o try
o finally
o catch
o throw
o throws

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Frage 95 von 200

95. Which of these operator is used to generate an instance of an exception than can be thrown by using throw?

Wähle eine der folgenden:

o new
o malloc
o alloc
o thrown
o return

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Frage 96 von 200

96. Which of the followings is a type of stream in java?

Wähle eine der folgenden:

o Integer stream
o Byte stream
o Short stream
o Long stream

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Frage 97 von 200

97. What will be the output of the following program?

Wähle eine der folgenden:

o BD
o ABDE
o BCDE
o BCD
o BDE
o ABCE
o ABCD
o ABD

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Frage 98 von 200

98. What will be the output of the following code?

Wähle eine der folgenden:

o hello caught finally after
o hello throwit finally
o hello throwit caught finally after
o hello caught after
o compilation fails
o caught finally after

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Frage 99 von 200

99. What will be the output of the program?

Wähle eine der folgenden:

o finally
o Compilation fails
o exception finished
o finally finished
o finally exception finished
o finally exception

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Frage 100 von 200

100. What will be the output of the program?

Wähle eine der folgenden:

o ABCD
o ACD
o ABD
o BCD
o BC
o BD
o CD

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Frage 101 von 200

101. What will be the output of the program?

Wähle eine der folgenden:

o Hello world
o Hello world Finally executing
o Finally executing
o Nothing. The program will not compile because no exceptions are specified
o Nothing. The program will not compile because no catch clauses are specified

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Frage 102 von 200

102. What will be the output of the program?

Wähle eine der folgenden:

o Ex0 caught
o Exception caught
o Compilation fails on line 2
o Compilation fails on line 9
o Compilation fails on line 11

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Frage 103 von 200

103. Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

Wähle eine der folgenden:

o java.util.HashSet
o java.util.List
o java.util.LinkedHashSet
o java.util.ArrayList
o java.util.HashMap
o java.util.Map

Erklärung

Frage 104 von 200

104. You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

Wähle eine der folgenden:

o java.util.Map
o java.util.List
o java.util.Set
o java.util.Collection

Erklärung

Frage 105 von 200

105. Which interface does java.util.Hashtable implement?

Wähle eine der folgenden:

o java.util.Map
o java.util.List
o java.util.HashTable
o java.util.Set
o java.util.Collection

Erklärung

Frage 106 von 200

106. Which interface provides the capability to store objects using a key-value pair?

Wähle eine der folgenden:

o java.util.Map
o java.util.List
o java.util.HashTable
o java.util.Set
o java.util.Collection

Erklärung

Frage 107 von 200

107. What line of code should replace the missing statement to make this program compile?

Wähle eine der folgenden:

o import java.io.*;
o import java.io.PrintWriter
o include java.io.*;
o no statement required

Erklärung

Frage 108 von 200

108. What is the numerical range of char?

Wähle eine der folgenden:

o 0 .. 32767
o 0 .. 65535
o -256 .. 255
o 0 .. 255
o -32768 .. 32767
o 0 .. 511

Erklärung

Frage 109 von 200

109. In Java, defining more than one method having the same name within a particular class is called

Wähle eine der folgenden:

o overloading
o sharing
o overriding
o superseding

Erklärung

Frage 110 von 200

110. What is an inheritance?

Wähle eine der folgenden:

o It is the process where one object acquires the properties of another
o Inheritance is the ability of an object to take on many forms
o Inheritance is a technique to define different methods of same types
o None of the above.

Erklärung

Frage 111 von 200

111. When constructor is called?

Wähle eine der folgenden:

o Constructor is called before creating the object
o Constructor is called after creating the object
o Constructor is called concurrently when object creation is going on
o Constructor cannot be called

Erklärung

Frage 112 von 200

112. What is the difference between a try-catch block and a try-catch-finally block?

Wähle eine der folgenden:

o try-catch contains code to execute whether an occurs or not, try-catch-finally contains code to execute only if an error occurs
o try-catch contains code to execute if an error occurs or not, while try-catch-finally works the same way as try-catch block with the addition of a set of code that will execute whether an error occurs or not
o Same thing, different names
o try-catch contains code to execute only if an error occurs, try-catch-finally contains code to execute whether an occurs or not

Erklärung

Frage 113 von 200

113. Which keyword would you use if you wanted a class to use an interface?

Wähle eine der folgenden:

o implements
o extends
o throws
o new
o main()

Erklärung

Frage 114 von 200

114. Which keyword would you use to break out of a loop?

Wähle eine der folgenden:

o break
o continue
o while
o for
o do

Erklärung

Frage 115 von 200

115. What will be the output of this code? <html> String a = “Crayons are great!”; System.out.println(a.charAt(8));</html>

Wähle eine der folgenden:

Erklärung

Frage 116 von 200

116. Which package is imported by default into Java programs?

Wähle eine der folgenden:

o java.awt
o java.awt.font
o java.lang
o java.io
o java.util

Erklärung

Frage 117 von 200

What is the purpose of a class constructor?

Wähle eine der folgenden:

o To make objects initially have certain values when they are instantiated
o To extend a class
o To pass values to methods for a class
o To instantiate an object

Erklärung

Frage 118 von 200

117. What will be the output of the program?

Wähle eine der folgenden:

o 0
o error
o Compilation fails
o An uncaught exception is thrown at runtime
o No output
o / by 0

Erklärung

Frage 119 von 200

118. Given : -A and E are classes -B and D are interfaces -C is an abstract class Which is true?

Wähle eine der folgenden:

o class F implements B,C
o class F implements C
o class F extends A,C
o class F implements E
o class F extends C implements B
o class F extends B

Erklärung

Frage 120 von 200

119. Given Note: The keyword "instanceof" is use to check whether an object is of a particular type What is the result?

Wähle eine der folgenden:

o Compilation fails due to error at line 3
o Will produce output as false
o Compilation fails due to error at line 4
o Length of this array is 3
o Will produce output a true

Erklärung

Frage 121 von 200

120. What will be the output?

Wähle eine der folgenden:

o Got the Test Exception Inside finally block
o Inside finally block
o Got the Test Exception
o Compilation fails

Erklärung

Frage 122 von 200

121. What will be the output?

Wähle eine der folgenden:

o Caught base class exception
o Caught derived class exception
o Compiler error because derived is not throwable
o Compiler error because base class exception is caught before derived class

Erklärung

Frage 123 von 200

122. A java array that contains N components will be indexed from ….. through …..

Wähle eine der folgenden:

o 0, N – 1
o 1, N
o 0, N
o 1, N - 1

Erklärung

Frage 124 von 200

123. Which method must exist, to make your class executable?

Wähle eine der folgenden:

o main
o begin
o init
o int
o paint

Erklärung

Frage 125 von 200

124. What will be output produced after the execution of the following code segment? String name = “Elvis”; System.out.println(name + “was here”);

Wähle eine der folgenden:

o Elviswas here
o Elvis was here
o namewas here
o name was here
o name + was here

Erklärung

Frage 126 von 200

125. What will be output produced after the execution of the following code segment? int x = 5; int y = 2; System.out.println(x + “1“ + y);

Wähle eine der folgenden:

o 512
o 5 1 2
o 8
o The code will cause a compilation error

Erklärung

Frage 127 von 200

126. What will be output produced after the execution of the following code segment? int x = 5; int y = 2; System.out.println(x + y + “1“);

Wähle eine der folgenden:

o 71
o 521
o 5 2 1
o 7 1
o The code will cause a compilation error
o All are valid

Erklärung

Frage 128 von 200

127. What will be the result of the following code segment?

Wähle eine der folgenden:

o 2 4 6 8
o 2 4 6 8 10
o 2 4 6 8 10 1 3 5 7 9
o 1 3 5 7 9
o 9 7 5 3 1 10 8 6 4 2

Erklärung

Frage 129 von 200

128. What is the output of the following code segment?

Wähle eine der folgenden:

o A
o B
o C
o D or lower

Erklärung

Frage 130 von 200

129. If you want to execute body at least once, what type of loop would you use?

Wähle eine der folgenden:

o for loop
o while loop
o none of the given
o do .. while loop

Erklärung

Frage 131 von 200

130. What are the values of I and product after this code is executed?

Wähle eine der folgenden:

o 9 and 366
o 9 and 336
o 8 and 42
o 8 and 336

Erklärung

Frage 132 von 200

131. What is the output of the following code fragment?

Wähle eine der folgenden:

o Error
o 2 times Hello
o 3 times Hello
o No output will be produced

Erklärung

Frage 133 von 200

132. What is the purpose of the semicolon mark (;) in a Java program?

Wähle eine der folgenden:

o Designates a temporary separation when used in a package statement.
o It is used once and only once in a program
o Designates the end of a statement or unit of Java code.
o It is used only with JApplet class.
o It is an optional end-of-file marker

Erklärung

Frage 134 von 200

133. What is the size of short variable?

Wähle eine der folgenden:

o 8 bit
o 16 bit
o 32 bit
o 64 bit

Erklärung

Frage 135 von 200

134. Which of the following is true about public access modifier?

Wähle eine der folgenden:

o Variables, methods and constructors which are declared public can be accessed by any class.
o Variables, methods and constructors which are declared public can be accessed by any class lying in same package
o Variables, methods and constructors which are declared public in the superclass can be accessed only by its child class
o No right answer

Erklärung

Frage 136 von 200

135. Which of the following is not a keyword in Java?

Wähle eine der folgenden:

o static
o void
o Boolean
o private

Erklärung

Frage 137 von 200

136. Which of the following stands true about default modifier of class members?

Wähle eine der folgenden:

o By default, variables, methods and constructors can be accessed by subclass only.
o By default, variables, methods and constructors can be accessed by any class lying in any package.
o By default, variables, methods and constructors can be accessed by any class lying in the same package.
o No right answer

Erklärung

Frage 138 von 200

137. Inheritance represents

Wähle eine der folgenden:

o HAS-A relationship
o IS-A relationship

Erklärung

Frage 139 von 200

138. What is function overloading?

Wähle eine der folgenden:

o Methods with same name but different parameters.
o Methods with same name but different return types
o Methods with same name, same parameter types but different parameter names.
o No right answer

Erklärung

Frage 140 von 200

139. What is a class in java?

Wähle eine der folgenden:

o A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object
o class is a special data type
o class is used to allocate memory to a data type.
o No right answer

Erklärung

Frage 141 von 200

140. Can be constructor be made private?

Wähle eins der folgenden:

WAHR
FALSCH

Erklärung

Frage 142 von 200

141. What is JRE?

Wähle eine der folgenden:

o JRE is a java based GUI application.
o JRE is an application development framework
o JRE is an implementation of the Java Virtual Machine which executes Java programs
o No right answer

Erklärung

Frage 143 von 200

142. What is essential in making sure that your loop is not infinite?

Wähle eine der folgenden:

o That your Boolean statement at some point will be false
o That your Boolean statement at some point will be true
o That there is a Boolean statement somewhere in your code
o All answers are right

Erklärung

Frage 144 von 200

143. In a “for” loop, what section is not included in parentheses after “for”?

Wähle eine der folgenden:

o Initialization
o Loop body
o Test statement
o Update

Erklärung

Frage 145 von 200

144. Abstract method can be in

Wähle eine der folgenden:

o abstract class
o normal class
o concrete class
o any class

Erklärung

Frage 146 von 200

145. One or more function that has different number of arguments or different type of arguments but all have the same return type is called as

Wähle eine der folgenden:

o Method overriding
o Method overloading
o Inheritance
o Encapsulation

Erklärung

Frage 147 von 200

146. Static variables cannot be accessed directly from the class level

Wähle eins der folgenden:

WAHR
FALSCH

Erklärung

Frage 148 von 200

147. When a class is based on another class, it inherits:

Wähle eine der folgenden:

o The data and methods for the class
o The methods and messages for the class
o Only the data for the class
o Static block of that class

Erklärung

Frage 149 von 200

148. When sub class declares a method that has the same type arguments as a method in the parent class, it is termed as

Wähle eine der folgenden:

o Method overriding
o Method overloading
o Operator overloading
o Operator overriding

Erklärung

Frage 150 von 200

149. Constructors are used to

Wähle eine der folgenden:

o Build a user interface
o Free memory
o Initialize a newly created object
o To create a sub class

Erklärung

Frage 151 von 200

150. What is a template, or specification, that determines a type of object in java?

Wähle eine der folgenden:

o A class
o A template
o A struct
o A prototype
o A framework

Erklärung

Frage 152 von 200

151. The process by which one object can acquire the properties of another object?

Wähle eine der folgenden:

o Encapsulation
o Inheritance
o Polymorphism
o Aggregation

Erklärung

Frage 153 von 200

152. What is the highest index value is associated with the array that follows? byte[] values = new byte[x];

Wähle eine der folgenden:

o 0
o x
o x+1
o x-1

Erklärung

Frage 154 von 200

153. which of the following statements gets the number of integers in the array that follows? int[] customers = new int[55];

Wähle eine der folgenden:

o int size = customers.length();
o int size = customers.size();
o int size = costomers.length;
o int size = Arrays.size(customers);
o int size = Arrays.length(customers);

Erklärung

Frage 155 von 200

154. What will be the output of the following code? int[] arr = new int[9]; System.out.println(arr[9]);

Wähle eine der folgenden:

o 0
o Some junk value
o Error because array is not initialized
o Error because index out of range

Erklärung

Frage 156 von 200

155. When an object no longer has any reference variables referring to it, what happens to the object?

Wähle eine der folgenden:

o It sits around in main memory forever
o It is swapped out the disk
o It is sent to the Dumpster
o The garbage collector makes the memory it occupies available for new objects

Erklärung

Frage 157 von 200

156. What value is assigned to a reference value to show that there is no object?

Wähle eine der folgenden:

o 0
o null
o void
o 0x00000
o “”

Erklärung

Frage 158 von 200

158. Which one of the below shows the correct use of public to modify a method?

Wähle eine der folgenden:

Public Void init()
public class MyProgram()
void public init()
public int myMethod()
init() public void

Erklärung

Frage 159 von 200

159.Which statement is accurate for the use of void with a method?

Wähle eine der folgenden:

The void keyword means that the method will not return a value.
The void keyword denotes a particular instance of the void class.
The void method returns a void data type.
The void keyword means that the statements in the method are not executed.
This keyword voids the effects of a method.

Erklärung

Frage 160 von 200

160. Which of the below shows the correct form of a method? public int void goodBye() { code here }

Wähle eine der folgenden:

public void MyProgram() { code here}
public voided hello() { code here } public
intGoodBye();
private int goodBye() {code here }

Erklärung

Frage 161 von 200

161. Which of the following is the closing brace for a block of statements in a method?

Wähle eine der folgenden:

[
{
]
}
()

Erklärung

Frage 162 von 200

162. If a class has one method in it, which of the following would be the last two symbols in the program?

Wähle eine der folgenden:

{}
))
}}
)}
}{

Erklärung

Frage 163 von 200

163. Given the line, public class MyTextArea extends JTextArea {, which of the following statements is correct?

Wähle eine der folgenden:

JTextArea is a subclass of MyTextArea.
MyTextArea is a superclass of the extends class.
MyTextArea is a subclass of the JText class.
JTextArea is a superclass of MyTextArea.
JTextArea is a class of MyTextArea.

Erklärung

Frage 164 von 200

164. What will be the output of the program?

Wähle eine der folgenden:

0 1 2
0 1 2 1 2 2
2 1 0 1 0 0
2 1 2 0 1 2
2 1 2 1 0 2

Erklärung

Frage 165 von 200

165. What will be the output of the program?

Wähle eine der folgenden:

XyZabc
XyZABC
xyzabc
abcXyZ
abcxyz

Erklärung

Frage 166 von 200

166. Which of the following will directly stop the execution of a Thread?

Wähle eine der folgenden:

wait()
notifyAll()
notify()
exits synchronized code

Erklärung

Frage 167 von 200

167. What will be the output of the program?

Wähle eine der folgenden:

It compiles and runs printing nothing It
compiles but fails at runtime
Compile error
It compiles and runs printing “complete”

Erklärung

Frage 168 von 200

168. What allows the programmer to destroy an object x? x.delete();

Wähle eine der folgenden:

x.destroy();
x.clean();
Runtime.getRuntime.gc(x);
Only the garbage collection system can destroy the object

Erklärung

Frage 169 von 200

169. Information hiding can also be termed as

Wähle eine der folgenden:

Data hiding
Encapsulation
Inheritance
Data minding

Erklärung

Frage 170 von 200

170. Two or more functions with same name in the same class with different arguments is called as

Wähle eine der folgenden:

Method overriding
Method overloading
Encapsulation

Erklärung

Frage 171 von 200

171. When sub class declares a method that has the same type arguments as a method declared by one of its superclass it is termed as

Wähle eine der folgenden:

Method overriding
Method overloading
Operator overriding
Operator overloading

Erklärung

Frage 172 von 200

172. What does closing file do?

Wähle eine der folgenden:

Flushes pending output and finishes processing the file
Finishes processing the file, only
Flushes pending output, but the file may still be written to
Makes the file read-only

Erklärung

Frage 173 von 200

173. What method ensures that data from previous calls to write() is sent to disk and leaves the file open?

Wähle eine der folgenden:

flush()
close()
each write() does this for the previous one.
print()

Erklärung

Frage 174 von 200

174. If a file opened for reading does not exist, which of the following events will occur in Java?

Wähle eine der folgenden:

A run-time error will occur
A NullPointerException will be rised
A FileNotFoundException will be rised
A new file will be created

Erklärung

Frage 175 von 200

175. If a file opened for writing does not exist, which of the following events will occur in Java?

Wähle eine der folgenden:

A NullPointerException will be rised
A run-time error will occur
A FileNotFoundException will be rised
A new file will be created

Erklärung

Frage 176 von 200

176. If a class contains a constructor, that constructor will be invoked

Wähle eine der folgenden:

Each time an object of that class is instantiated
Each time an object of that class goes out of scope
Once at the beginning of any program that uses that class
Each time a method of an object of that class is invoked

Erklärung

Frage 177 von 200

177. In Java, the default layout manager for a JFrame component is

Wähle eine der folgenden:

a) GridLayout
b) FlowLayout
c) GridingLayout
d) BorderLayout

Erklärung

Frage 178 von 200

178. Linked list cannot be implemented by using arrays

Wähle eins der folgenden:

WAHR
FALSCH

Erklärung

Frage 179 von 200

179. Can stack be described as a pointer?

Wähle eins der folgenden:

WAHR
FALSCH

Erklärung

Frage 180 von 200

180. What is the signature of the method specified in the Java ActionListener interface?

Wähle eine der folgenden:

a) void actionPerformed (ActionListener al)
c) void actionListener (ActionEvent ae)
b) void actionEvent (ActionPerformed ap)
d) void actionPerformed (ActionEvent ae)

Erklärung

Frage 181 von 200

181. How many String objects have been created?
String x = new String("xyz");
String y = "abc";
x = x + y;

Wähle eine der folgenden:

a) 1
b) 2
c) 3
d) 4

Erklärung

Frage 182 von 200

182. Which of the following is a Java event that is generated when a JButton component is pressed?

Wähle eine der folgenden:

a) ButtonEvent
b) WindowEvent
c) ClickEvent
d) ActionEvent

Erklärung

Frage 183 von 200

183. Which one is true declaration?
1 final abstract class Test {}
2 public static interface Test {}
3 final public class Test {}
4 protected abstract class Test {}

Wähle eine der folgenden:

Erklärung

Frage 184 von 200

184. What is the keyword in java used to create an instance?

Wähle eine der folgenden:

a) this
b) object
d) none of the above
c) new

Erklärung

Frage 185 von 200

185. You can create java project same as:

Wähle eine der folgenden:

a) public class name
c) any name
b) Main.java
d) class name

Erklärung

Frage 186 von 200

186. Consider following coding:
public class Object1 {
protected String d(){
return "Hi"; }}
public class Object2 extends Object1 {
protected String d(){
return super.d(); }}
Which of the following statements are true regarding the definitions?
Class Object2 inherits from class Object1.
Class Object2 overrides method d.
Method d do not returns equivalent results when executed from either class.

Wähle eine der folgenden:

a) III
b) I, II, and III
c) I and III
d) I and II

Erklärung

Frage 187 von 200

187. What will be the output the following method Java code
import java.io.IOException

class Animal {
public void eat() throws IOException {
}
}
class Dog extends Animal {
public void eat() throws IOException {
}
}

Wähle eine der folgenden:

a) Compilation error at Line 8
b) Compilation error at Line 7
c) Compilation error at Line 6
d) successful compilation

Erklärung

Frage 188 von 200

188. What will be the output the following method Java code
import java.io.*;
public class Test {
public Test( ) {
System.out.println("default");
}
public Test( int i ) {
System.out.println("non-default");
}
public static void main(String[] args) {
Test t = new Test(2);
}
}

Wähle eine der folgenden:

a) The line of text "non-default" followed by the line of text "default"
b) The line of text "default"
c) The line of text "default" followed by the line of text "non-default"
d) The line of text "non-default"

Erklärung

Frage 189 von 200

189. The name of a Java source file.

Wähle eine der folgenden:

a) has no restrictions
b) must be the same as the class it defines, respecting case
c) must be the same as the class it defines, ignoring case
d) must use the extension .class

Erklärung

Frage 190 von 200

190. The ActionEvent class and ActionListener interface are available in the _____ package of Java.

Wähle eine der folgenden:

a) javax.swing.event
b) java.awt.event
c) javax.event
d) java.event

Erklärung

Frage 191 von 200

191. If a class has an association with itself, then the class contains

Wähle eine der folgenden:

a) its own superclass
b) an attribute that references an object of the same class
c) a method that calls itself
d) a method that calls another method within the same class

Erklärung

Frage 192 von 200

192. What will be the output?
class Equals
{
public static void main(String [] args)
{
int x = 100;
double y = 100.1;
boolean b = (x = y);
System.out.println(b);
}
}

Wähle eine der folgenden:

a) 100
c) 100.1
b) compilation error
d) true

Erklärung

Frage 193 von 200

193. In Java, what is the signature of the method in the WindowListener interface where code is to be added to end a program when the close button is pressed?

Wähle eine der folgenden:

a) void windowClosing (WindowEvent we)
b) void windowClosed (WindowEvent we)
c) void windowDeactivated (WindowEvent we)
d) void windowAdapter (WindowEvent we)

Erklärung

Frage 194 von 200

194. Which of the following implementation will you use if you were to insert elements at any position in the collection ??

Wähle eine der folgenden:

a) Vector
b) List
c) LinkedList
d) ArrayList

Erklärung

Frage 195 von 200

195. An empty list is the one which has no

Wähle eine der folgenden:

a) data
b) nodes
c) a and b
d)address

Erklärung

Frage 196 von 200

196. JVM stands for

Wähle eine der folgenden:

a) Java Verify Machine
b) Java Visual Machine
d) Java Virtual Machine
c) Java Visual Member

Erklärung

Frage 197 von 200

197. Which of the following is not the method of object class?

Wähle eine der folgenden:

a) toString
c) finalize
b) clone
d) system

Erklärung

Frage 198 von 200

198. Which of the following is True about final keyword

Wähle eine der folgenden:

a) We can declare abstract class as final.
b) We can modify final variables.
c) We can't declare a class abstract as well as final.
d) We can override final methods.

Erklärung

Frage 199 von 200

199. Which of the following is false about collections in Java ?

Wähle eine der folgenden:

b) java.util is the default package for collection classes.
a) List , Map and Set are interfaces.
c) Collection interface is the base interface.
d) List , Map and Set are abstract classes

Erklärung

Frage 200 von 200

200. Which of the following is not true for hashtable and hasmaps ?

Wähle eine der folgenden:

a) Hashtable are synchronized whereas hashmaps are not.
b) Hashtable doesn't allow null values whereas HashMaps allows null values.
c) Hashtable came before Hashmap
d) HashMaps are synchronized whereas hashtables are not.

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	Erstellt von Hello World vor mehr als 7 Jahre

Quiz am sdp200, erstellt von Hello World am 18/01/2017.

sdp200

Frage 1 von 200

1. What will be the output of the program?<br>

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Frage 2 von 200

2. Select how you would run your program to cause it to print: Arg is 2 <br>

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Frage 3 von 200

3. [html]What does the following code do? <br>void blur(char[] z, String st) {<br> if(z.length < st.length()) retrun; <br> for(int i = 0; i < st.length(); i++) <br> z[i] = st.charAt(i); <br>}

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Frage 4 von 200

4. Given the declaration of an array : int[] a = {1,2,3,4,5}; What is the value of a[4]?

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Frage 5 von 200

5. An array holds:

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Frage 6 von 200

6. [html]Java uses call by value. What is the value that is being passed into the routine by the method call in the following? <br> double rats[] = {1.2 , 2.3, 3.4}; <br> routine(rats);

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Frage 7 von 200

7. What is the prototype of the default constructor?<br>

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Frage 8 von 200

8. What is the widest valid returnType for methodA in line 3?<br>

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Frage 9 von 200

9. You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

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Frage 10 von 200

10. You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

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Frage 11 von 200

11. Let’s assume that you have class C and interface I ? Which of the following is correct statement?

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Frage 12 von 200

12. Which is valid in a class that extends class A?<br>

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Frage 13 von 200

13. Which statement is true?

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Frage 14 von 200

14. What will be the output of the program?<br>

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Frage 15 von 200

15. Given a method in a class, what access modifier do you use to restrict access to that method to only the other members of the same class?

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Frage 16 von 200

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Frage 17 von 200

17. What will be the output of the program?<br>

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Frage 18 von 200

18. What will be the output of the program after the running program in such way :/> java Test red green blue?<br>

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Frage 19 von 200

19. Which is a valid declaration within an interface?

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Frage 20 von 200

20. Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

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26. The following block of code creates a Thread using a Runnable target: <br>
br> Which of the following classes can be used to create the target, so that the preceding code compiles correctly?