sdp200

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Question 1 of 200

1. What will be the output of the program?

Select one of the following:

o Pine
o Oak
o Tree
o Forest
o Oops

Explanation

Question 2 of 200

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

Select one of the following:

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

Explanation

Question 3 of 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); }

Select one of the following:

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

Explanation

Question 4 of 200

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

Select one of the following:

Explanation

Question 5 of 200

5. An array holds:

Select one of the following:

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

Explanation

Question 6 of 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);

Select one of the following:

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

Explanation

Question 7 of 200

7. What is the prototype of the default constructor?

Select one of the following:

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

Explanation

Question 8 of 200

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

Select one of the following:

o int
o long
o byte
o double
o void

Explanation

Question 9 of 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?

Select one of the following:

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

Explanation

Question 10 of 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?

Select one of the following:

o public
o private
o protected
o transient
o volatile

Explanation

Question 11 of 200

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

Select one of the following:

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

Explanation

Question 12 of 200

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

Select one of the following:

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; }

Explanation

Question 13 of 200

13. Which statement is true?

Select one of the following:

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

Explanation

Question 14 of 200

14. What will be the output of the program?

Select one of the following:

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

Explanation

Question 15 of 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?

Select one of the following:

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

Explanation

Question 16 of 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.

Select one of the following:

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

Explanation

Question 17 of 200

17. What will be the output of the program?

Select one of the following:

o AC
o ACD
o BD
o ABCD
o ABD

Explanation

Question 18 of 200

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

Select one of the following:

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

Explanation

Question 19 of 200

19. Which is a valid declaration within an interface?

Select one of the following:

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;

Explanation

Question 20 of 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?

Select one of the following:

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

Explanation

Question 21 of 200

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

Select one of the following:

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

Explanation

Question 22 of 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

Select one of the following:

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

Explanation

Question 23 of 200

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

Select one of the following:

o Object
o Thread
o Runnable
o Class

Explanation

Question 24 of 200

24. What will be the output of the program?

Select one of the following:

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

Explanation

Question 25 of 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

Select one of the following:

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

Explanation

Question 26 of 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?

Select one of the following:

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(){}}

Explanation

Question 27 of 200

27. What will be the output of the program?

Select one of the following:

o AB
o BC
o BCD
o ABC
o ACD

Explanation

Question 28 of 200

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

Select one of the following:

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

Explanation

Question 29 of 200

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

Select one of the following:

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();

Explanation

Question 30 of 200

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

Select one of the following:

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

Explanation

Question 31 of 200

31. Which of the following statements is correct?

Select one of the following:

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

Explanation

Question 32 of 200

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

Select one of the following:

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)

Explanation

Question 33 of 200

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

Select one of the following:

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

Explanation

Question 34 of 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”); } } }

Select one of the following:

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

Explanation

Question 35 of 200

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

Select one of the following:

o Type checking
o Multitasking
o Polymorphism
o Information hiding

Explanation

Question 36 of 200

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

Select one of the following:

True
False

Explanation

Question 37 of 200

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

Select one of the following:

o Encapsulation
o Inheritance
o Polymorphism

Explanation

Question 38 of 200

38. Constructors are used to

Select one of the following:

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

Explanation

Question 39 of 200

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

Select one of the following:

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

Explanation

Question 40 of 200

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

Select one of the following:

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

Explanation

Question 41 of 200

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

Select one of the following:

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

Explanation

Question 42 of 200

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

Select one of the following:

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

Explanation

Question 43 of 200

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

Select one of the following:

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

Explanation

Question 44 of 200

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

Select one of the following:

o A method
o A process
o A thread

Explanation

Question 45 of 200

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

Select one of the following:

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

Explanation

Question 46 of 200

46. You designate a method as being synchronized by:

Select one of the following:

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

Explanation

Question 47 of 200

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

Select one of the following:

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

Explanation

Question 48 of 200

48. What is a buffer?

Select one of the following:

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

Explanation

Question 49 of 200

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

Select one of the following:

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

Explanation

Question 50 of 200

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

Select one of the following:

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

Explanation

Question 51 of 200

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

Select one of the following:

True
False

Explanation

Question 52 of 200

52. Set allows at most two null elements?

Select one of the following:

True
False

Explanation

Question 53 of 200

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

Select one of the following:

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

Explanation

Question 54 of 200

54. A class cannot define more than one constructor

Select one of the following:

True
False

Explanation

Question 55 of 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?

Select one of the following:

o Queue
o Stack
o ArrayList
o LinkedList

Explanation

Question 56 of 200

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

Select one of the following:

True
False

Explanation

Question 57 of 200

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

Select one of the following:

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

Explanation

Question 58 of 200

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

Select one of the following:

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

Explanation

Question 59 of 200

59. List is a/an …?

Select one of the following:

o Class
o Interface
o Both
o Package

Explanation

Question 60 of 200

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

Select one of the following:

o IOException
o FileNotFoundException
o ReadException
o AccessDeniedException

Explanation

Question 61 of 200

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

Select one of the following:

o class
o final
o private
o static

Explanation

Question 62 of 200

62. What is Recursion in Java?

Select one of the following:

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

Explanation

Question 63 of 200

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

Select one of the following:

o Array
o Stack
o Queue
o Tree
o Map

Explanation

Question 64 of 200

64. What will be an output?

Select one of the following:

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

Explanation

Question 65 of 200

65. What will be an output?

Select one of the following:

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

Explanation

Question 66 of 200

66. What will be an output?

Select one of the following:

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

Explanation

Question 67 of 200

67. What will be an output?

Select one of the following:

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

Explanation

Question 68 of 200

68. Deletion is faster in LinkedList than ArrayList

Select one of the following:

True
False

Explanation

Question 69 of 200

69. Can a top level class be private?

Select one of the following:

True
False

Explanation

Question 70 of 200

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

Select one of the following:

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

Explanation

Question 71 of 200

71. The term wrapper class refers to

Select one of the following:

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

Explanation

Question 72 of 200

72. What will be the output of the program?

Select one of the following:

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

Explanation

Question 73 of 200

73. What will be the output of the program?

Select one of the following:

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

Explanation

Question 74 of 200

74. What will be the output of the program?

Select one of the following:

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

Explanation

Question 75 of 200

75. What will be the output of the program?

Select one of the following:

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

Explanation

Question 76 of 200

76. What will be the output of the program?

Select one of the following:

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

Explanation

Question 77 of 200

77. What will be the output of the program?

Select one of the following:

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

Explanation

Question 78 of 200

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

Select one of the following:

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

Explanation

Question 79 of 200

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

Select one of the following:

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

Explanation

Question 80 of 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

Select one of the following:

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

Explanation

Question 81 of 200

81. What will be the output of the program?

Select one of the following:

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

Explanation

Question 82 of 200

82. What will be the output of the program?

Select one of the following:

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

Explanation

Question 83 of 200

83. What will be the output of the program?

Select one of the following:

o Base
o Derived
o Compilation error
o Runtime error

Explanation

Question 84 of 200

84. What will be the output of the program?

Select one of the following:

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

Explanation

Question 85 of 200

85. What will be the output of the program?

Select one of the following:

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)

Explanation

Question 86 of 200

86. What will be the output of the program?

Select one of the following:

o 20
o 0
o Compilation error
o Runtime error

Explanation

Question 87 of 200

87. What will be the output of the program?

Select one of the following:

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

Explanation

Question 88 of 200

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

Select one of the following:

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

Explanation

Question 89 of 200

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

Select one of the following:

o InputStream
o ReadStream
o Writer
o OutputStream

Explanation

Question 90 of 200

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

Select one of the following:

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

Explanation

Question 91 of 200

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

Select one of the following:

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

Explanation

Question 92 of 200

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

Select one of the following:

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

Explanation

Question 93 of 200

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

Select one of the following:

o try
o catch
o throw
o thrown
o finally

Explanation

Question 94 of 200

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

Select one of the following:

o try
o finally
o catch
o throw
o throws

Explanation

Question 95 of 200

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

Select one of the following:

o new
o malloc
o alloc
o thrown
o return

Explanation

Question 96 of 200

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

Select one of the following:

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

Explanation

Question 97 of 200

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

Select one of the following:

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

Explanation

Question 98 of 200

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

Select one of the following:

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

Explanation

Question 99 of 200

99. What will be the output of the program?

Select one of the following:

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

Explanation

Question 100 of 200

100. What will be the output of the program?

Select one of the following:

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

Explanation

Question 101 of 200

101. What will be the output of the program?

Select one of the following:

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

Explanation

Question 102 of 200

102. What will be the output of the program?

Select one of the following:

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

Explanation

Question 103 of 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?

Select one of the following:

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

Explanation

Question 104 of 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?

Select one of the following:

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

Explanation

Question 105 of 200

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

Select one of the following:

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

Explanation

Question 106 of 200

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

Select one of the following:

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

Explanation

Question 107 of 200

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

Select one of the following:

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

Explanation

Question 108 of 200

108. What is the numerical range of char?

Select one of the following:

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

Explanation

Question 109 of 200

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

Select one of the following:

o overloading
o sharing
o overriding
o superseding

Explanation

Question 110 of 200

110. What is an inheritance?

Select one of the following:

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.

Explanation

Question 111 of 200

111. When constructor is called?

Select one of the following:

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

Explanation

Question 112 of 200

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

Select one of the following:

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

Explanation

Question 113 of 200

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

Select one of the following:

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

Explanation

Question 114 of 200

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

Select one of the following:

o break
o continue
o while
o for
o do

Explanation

Question 115 of 200

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

Select one of the following:

Explanation

Question 116 of 200

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

Select one of the following:

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

Explanation

Question 117 of 200

What is the purpose of a class constructor?

Select one of the following:

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

Explanation

Question 118 of 200

117. What will be the output of the program?

Select one of the following:

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

Explanation

Question 119 of 200

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

Select one of the following:

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

Explanation

Question 120 of 200

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

Select one of the following:

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

Explanation

Question 121 of 200

120. What will be the output?

Select one of the following:

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

Explanation

Question 122 of 200

121. What will be the output?

Select one of the following:

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

Explanation

Question 123 of 200

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

Select one of the following:

o 0, N – 1
o 1, N
o 0, N
o 1, N - 1

Explanation

Question 124 of 200

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

Select one of the following:

o main
o begin
o init
o int
o paint

Explanation

Question 125 of 200

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

Select one of the following:

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

Explanation

Question 126 of 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);

Select one of the following:

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

Explanation

Question 127 of 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“);

Select one of the following:

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

Explanation

Question 128 of 200

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

Select one of the following:

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

Explanation

Question 129 of 200

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

Select one of the following:

o A
o B
o C
o D or lower

Explanation

Question 130 of 200

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

Select one of the following:

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

Explanation

Question 131 of 200

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

Select one of the following:

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

Explanation

Question 132 of 200

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

Select one of the following:

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

Explanation

Question 133 of 200

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

Select one of the following:

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

Explanation

Question 134 of 200

133. What is the size of short variable?

Select one of the following:

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

Explanation

Question 135 of 200

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

Select one of the following:

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

Explanation

Question 136 of 200

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

Select one of the following:

o static
o void
o Boolean
o private

Explanation

Question 137 of 200

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

Select one of the following:

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

Explanation

Question 138 of 200

137. Inheritance represents

Select one of the following:

o HAS-A relationship
o IS-A relationship

Explanation

Question 139 of 200

138. What is function overloading?

Select one of the following:

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

Explanation

Question 140 of 200

139. What is a class in java?

Select one of the following:

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

Explanation

Question 141 of 200

140. Can be constructor be made private?

Select one of the following:

True
False

Explanation

Question 142 of 200

141. What is JRE?

Select one of the following:

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

Explanation

Question 143 of 200

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

Select one of the following:

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

Explanation

Question 144 of 200

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

Select one of the following:

o Initialization
o Loop body
o Test statement
o Update

Explanation

Question 145 of 200

144. Abstract method can be in

Select one of the following:

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

Explanation

Question 146 of 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

Select one of the following:

o Method overriding
o Method overloading
o Inheritance
o Encapsulation

Explanation

Question 147 of 200

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

Select one of the following:

True
False

Explanation

Question 148 of 200

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

Select one of the following:

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

Explanation

Question 149 of 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

Select one of the following:

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

Explanation

Question 150 of 200

149. Constructors are used to

Select one of the following:

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

Explanation

Question 151 of 200

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

Select one of the following:

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

Explanation

Question 152 of 200

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

Select one of the following:

o Encapsulation
o Inheritance
o Polymorphism
o Aggregation

Explanation

Question 153 of 200

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

Select one of the following:

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

Explanation

Question 154 of 200

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

Select one of the following:

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);

Explanation

Question 155 of 200

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

Select one of the following:

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

Explanation

Question 156 of 200

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

Select one of the following:

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

Explanation

Question 157 of 200

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

Select one of the following:

o 0
o null
o void
o 0x00000
o “”

Explanation

Question 158 of 200

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

Select one of the following:

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

Explanation

Question 159 of 200

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

Select one of the following:

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.

Explanation

Question 160 of 200

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

Select one of the following:

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

Explanation

Question 161 of 200

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

Select one of the following:

[
{
]
}
()

Explanation

Question 162 of 200

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

Select one of the following:

{}
))
}}
)}
}{

Explanation

Question 163 of 200

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

Select one of the following:

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.

Explanation

Question 164 of 200

164. What will be the output of the program?

Select one of the following:

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

Explanation

Question 165 of 200

165. What will be the output of the program?

Select one of the following:

XyZabc
XyZABC
xyzabc
abcXyZ
abcxyz

Explanation

Question 166 of 200

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

Select one of the following:

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

Explanation

Question 167 of 200

167. What will be the output of the program?

Select one of the following:

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

Explanation

Question 168 of 200

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

Select one of the following:

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

Explanation

Question 169 of 200

169. Information hiding can also be termed as

Select one of the following:

Data hiding
Encapsulation
Inheritance
Data minding

Explanation

Question 170 of 200

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

Select one of the following:

Method overriding
Method overloading
Encapsulation

Explanation

Question 171 of 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

Select one of the following:

Method overriding
Method overloading
Operator overriding
Operator overloading

Explanation

Question 172 of 200

172. What does closing file do?

Select one of the following:

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

Explanation

Question 173 of 200

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

Select one of the following:

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

Explanation

Question 174 of 200

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

Select one of the following:

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

Explanation

Question 175 of 200

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

Select one of the following:

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

Explanation

Question 176 of 200

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

Select one of the following:

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

Explanation

Question 177 of 200

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

Select one of the following:

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

Explanation

Question 178 of 200

178. Linked list cannot be implemented by using arrays

Select one of the following:

True
False

Explanation

Question 179 of 200

179. Can stack be described as a pointer?

Select one of the following:

True
False

Explanation

Question 180 of 200

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

Select one of the following:

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

Explanation

Question 181 of 200

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

Select one of the following:

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

Explanation

Question 182 of 200

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

Select one of the following:

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

Explanation

Question 183 of 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 {}

Select one of the following:

Explanation

Question 184 of 200

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

Select one of the following:

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

Explanation

Question 185 of 200

185. You can create java project same as:

Select one of the following:

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

Explanation

Question 186 of 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.

Select one of the following:

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

Explanation

Question 187 of 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 {
}
}

Select one of the following:

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

Explanation

Question 188 of 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);
}
}

Select one of the following:

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"

Explanation

Question 189 of 200

189. The name of a Java source file.

Select one of the following:

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

Explanation

Question 190 of 200

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

Select one of the following:

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

Explanation

Question 191 of 200

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

Select one of the following:

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

Explanation

Question 192 of 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);
}
}

Select one of the following:

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

Explanation

Question 193 of 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?

Select one of the following:

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

Explanation

Question 194 of 200

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

Select one of the following:

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

Explanation

Question 195 of 200

195. An empty list is the one which has no

Select one of the following:

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

Explanation

Question 196 of 200

196. JVM stands for

Select one of the following:

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

Explanation

Question 197 of 200

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

Select one of the following:

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

Explanation

Question 198 of 200

198. Which of the following is True about final keyword

Select one of the following:

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.

Explanation

Question 199 of 200

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

Select one of the following:

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

Explanation

Question 200 of 200

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

Select one of the following:

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.

Explanation

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	Created by Hello World over 7 years ago

Quiz on sdp200, created by Hello World on 18/01/2017.

sdp200

Question 1 of 200

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

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Question 2 of 200

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

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Question 3 of 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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Question 4 of 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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Question 5 of 200

5. An array holds:

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Question 6 of 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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Question 7 of 200

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

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Question 8 of 200

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

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Question 9 of 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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Question 10 of 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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Question 11 of 200

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

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Question 12 of 200

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

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Question 13 of 200

13. Which statement is true?

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Question 14 of 200

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

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Question 15 of 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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Question 16 of 200

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Question 17 of 200

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

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Question 18 of 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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Question 19 of 200

19. Which is a valid declaration within an interface?

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Question 20 of 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?