Frage 1
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To declare a constant MAX_LENGTH as a member of the class, you write
Antworten
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final static MAX_LENGTH = 99.98
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final static float MAX_LENGTH = 99.98;
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static double MAX_LENGTH = 99.98
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final double MAX_LENGTH = 99.98
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final static double MAX_LENGTH = 99.98
Frage 2
Frage
What is the output of the following code:
import java.util.Date;
public class Test {
public static void main (String[] args) [
Date date1 = new Date();
Date date2 = new Date();
System.out.print((date1 == date2) + "" + (date1.getClass() == date2.getClass()));
}
}
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false false
-
true true
-
false true
-
true false
Frage 3
Frage
The abbreviation OOP stands for
Frage 4
Frage
In the following code, what is the newStudent method called:
public class newStudent{
public String name;
public int age;
public newStudent(){
age=5;
name = "Jim Jones"
}
}
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object
-
constructor
-
getter method
-
setter method
Frage 5
Frage
Consider the following code, which output is correct?
public class Student{
int age;
static int age2 = 3;
public static void main (String[] args){
Student student1;
Student student2;
Student student3;
student1 = new Student();
student1.age = 10;
student2 = student1;
student2.age -=5;
student 3 = new Student();
System.out.println(student1.age+:""+student2.age);
}
}
Frage 6
Frage
In the following code what is the getName() method referred to:
public class Student {
public String name;
public int age;
public String getName(){
return name;
}
public void setName(String newName){
name = newName;
}
}
Frage 7
Frage
A method that is associated with an individual object is called
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static method
-
class method
-
an instance method
-
an object method
Frage 8
Frage
In the following code what is the setName() method referred to:
public class Student{
public String name;
public int age;
public String getName(){
return name;
}
public void setName( String newName){
name = newName;
}
}
Antworten
-
setter method
-
getter method
-
constructor method
-
object initialization
Frage 9
Frage
What is the output of the following code?
public class Test{
public static void main (String[] args) {
String s1 = new String ("Welcome to Java!");
String s2 = new String("Welcome to Java!");
if (s1==s2)
System.out.println("s1 and s2 reference to the same String object");
else
System.out.println("s1 and s2 reference to different String objects");
}
}
Frage 10
Frage
Which of the following code in A or B, or both creates an object of the java.util.Date class?
A:
public class Test{
public Test(){
new java.util.Date();
}
}
B:
public class Test {
public Test(){
java.util.Date date = new java.util.Date();
}
}
Frage 11
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The variables that an object contains are called local variables
Frage 12
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The area of memory that objects reside in is known as the stack
Frage 13
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In the following code, the object created from class Student is stored in the variable myStudent.
Student myStudent;
myStudent = new Student();
Frage 14
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When a programmer neglects to delete objects that are no longer used it is referred to as a memory leak
Frage 15
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In java, Garbage Collection is the process that reclaims the memory used by objects which are no longer in use
Frage 16
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In java no variable can ever hold an object.
It can only hold a reference to an object.