Test : Java_12

This test contains 10 questions based on Java.
Each question answered correctly awards you 1 point and each incorrect answer has a penalty of -0.25 points, no points are deducted for unattempted answers.

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You Get +1 for each correct answer and -0.25 for each incorrect answer

Time Left - minutes :seconds

Which of the following statements are incorrect?

public members of class can be accessed by any code in the program.	private members of class can only be accessed by other members of the class.
protected members of a class can be inherited by a sub class, and become private members of the sub class.	private members of class can be inherited by a sub class, and become protected members in sub class.

D

What is the output of this program?

 interface calculate {
        void cal(int item);
    }
    class display implements calculate {
        int x;
        void cal(int item) {
            x = item * item;            
        }
    }
    class interfaces {
        public static void main(String args[]) {
            display arr = new display;
            arr.x = 0;      
            arr.cal(2);
            System.out.print(arr.x);
        }
    }

0	2
4	6

C

What is the output of this program?

 class A {
        public int i;
        public int j;
        A() {
            i = 1;
            j = 2;
 }
    }    
    class B extends A {
        int a;
        B() {
            super(ob);
        } 
    }    
    class super_use {
        public static void main(String args[])
        {
            B obj = new B();
            System.out.println(obj.i + " " + obj.j)     
        }
   }

1 2	2 1
Runtime Error	Compilation Error

A

Which of the following package stores all the standard java classes?

lang	java
util	java.packages

B

Which function of pre defined class Thread is used to check weather current thread being checked is still running?

Join()	isAlive()
isRunning()	Alive()

B

class Base { int x = 10; }
class Derived extends Base
{ int x = 20; }

Base b = new Base();
Derived d = new Derived ( );
Base bd = new Derived();
The statement
System.out.println(b.x + " " + d.x + " " + bd.x);

The output is:

10 20 10	10 20 20
20 10 20	20 20 10

A

What is the output of this program?

 interface calculate {
        void cal(int item);
    }
    class displayA implements calculate {
        int x;
        void cal(int item) {
            x = item * item;            
        }
    }
    class displayB implements calculate {
        int x;
        void cal(int item) {
            x = item / item;            
        }
    }
    class interfaces {
        public static void main(String args[]) {
            displayA arr1 = new displayA;
            displayB arr2 = new displayB;
            arr1.x = 0;
            arr2.x = 0;      
            arr1.cal(2);
            arr2.cal(2);
            System.out.print(arr1.x + " " + arr2.x);
        }
    }

0 0	2 2
4 1	1 4

C

What is the output of this program?

 abstract class A {
        int i;
        abstarct void display();
    }    
    class B extends A {
        int j;
        void display() {
            System.out.println(j);
        }
    }    
    class Abstract_demo {
        public static void main(String args[])
        {
            B obj = new B();
            obj.j=1;
            obj.display();    
        }
   }

0	1
2	3

C

Which function is used to perform some action when the object is to be destroyed?

delete()	finalize()
main()	None of the mentioned

B

What is the output of this program?

  class string_class {
        public static void main(String args[])
        {
            String obj = "I LIKE JAVA";   
            System.out.println(obj.length());
        }
    }

9	10
11	12

C

Finish Test