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Java Language | 20 Minute‐Test 2

Instruction

  • Total number of questions : 20.
  • Time alloted : 20 minutes.
  • Each question carry 1 mark.
  • No Negative marks
  • DO NOT refresh the page.
  • All the best :-).

1.

What will be the output of these statement?

class output {

        public static void main(String args[])

        {

            double a, b,c;

            a = 3.0/0;

            b = 0/4.0;

            c=0/0.0;

            System.out.println(a);

            System.out.println(b);

            System.out.println(c);

        }

             }
A.
INFINITY
B.
0.0
C.
NaN
D.
all of the mentioned

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

For floating point literals, we have constant value to represent (10/0.0) infinity either positive or negative and also have NaN (not a number for undefined like 0/0.0), but for the integral type, we don’t have any constant that’s why we get an arithmetic exception.
2.

What is the output of this program?

    class mainclass {

        public static void main(String args[])

        {

            boolean var1 = true;

      boolean var2 = false;

      if (var1)

          System.out.println(var1);

      else

          System.out.println(var2);

       }

    }
A.
0
B.
1
C.
true
D.
false

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
3.

What is the output of this program?

    class variable_scope {

        public static void main(String args[])

        {

            int x;

            x = 5;

            {

          int y = 6;

          System.out.print(x + " " + y);

            }

            System.out.println(x + " " + y);

        }

    }
A.
5 6 5 6
B.
5 6 5
C.
Runtime error
D.
Compilation error

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

Second print statement doesn’t have access to y , scope y was limited to the block defined after initialization of x.
4.

What is the output of this program?

    class A {

        final public int calculate(int a, int b) { return 1; }

    }

    class B extends A {

        public int calculate(int a, int b) { return 2; }

    }      public class output {

        public static void main(String args[])

        {

            B object = new B();

            System.out.print("b is " + b.calculate(0, 1));

          }

    }
A.
b is : 2
B.
b is : 1
C.
Compilation Error.
D.
An exception is thrown at runtime.

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

The code does not compile because the method calculate() in class A is final and so cannot be overridden by method of class b.
5.

What is the output of this program?

    class evaluate {

        public static void main(String args[])

            {

          int arr[] = new int[] {0 , 1, 2, 3, 4, 5, 6, 7, 8, 9};

          int n = 6;

                n = arr[arr[n] / 2];

          System.out.println(arr[n] / 2);

            }

    }
A.
3
B.
0
C.
6
D.
1

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

Array arr contains 10 elements. n contains 6 thus in next line n is given value 2 printing arr[2]/2 i:e 2/2 = 1.
6.

What is the output of this program?

    class increment {

        public static void main(String args[])

        {

                     int g = 3;

             System.out.print(++g * 8);

        }

    }
A.
25
B.
24
C.
32
D.
33

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Operator ++ has more preference than *, thus g becomes 4 and when multiplied by 8 gives 32.
7.

What is the output of this program?

    class leftshift_operator {

        public static void main(String args[])

        {

                     byte x = 64;

             int i;

             byte y;

             i = x << 2;

             y = (byte) (x << 2)

             System.out.print(i + " " + y);

        }

    }
A.
0 64
B.
64 0
C.
0 256
D.
256 0

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

None.
8.

What is the output of this program?

    class ternary_operator {

        public static void main(String args[])

        {

                     int x = 3;

             int y = ~ x;

             int z;

             z = x > y ? x : y;

             System.out.print(z);

        }

    }
A.
0
B.
1
C.
3
D.
-4

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
9.

What is the output of this program?

class Output {

        public static void main(String args[])

        {

                 int x=y=z=20;

         }

    }
A.
compile and runs fine
B.
20
C.
run time error
D.
compile time error

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

None.
10.

What is the output of this program?

    class jump_statments {

        public static void main(String args[])

        {

                     int x = 2;

             int y = 0;

             for ( ; y < 10; ++y) {

                 if (y % x == 0)

                     continue;

                   else if (y == 8)

                      break;

                 else

                    System.out.print(y + " ");

             }

        }

    }
A.
1 3 5 7
B.
2 4 6 8
C.
1 3 5 7 9
D.
1 2 3 4 5 6 7 8 9

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Whenever y is divisible by x remainder body of loop is skipped by continue statement, therefore if condition y == 8 is never true as when y is 8, remainder body of loop is skipped by continue statements of first if. Control comes to print statement only in cases when y is odd.
11.

What is the output of this program?

    class box {

        int width;

        int height;

        int length;

    }

    class mainclass {

        public static void main(String args[])

        {

             box obj = new box();

             obj.width = 10;

             obj.height = 2;

             obj.length = 10;

             int y = obj.width * obj.height * obj.length;

             System.out.print(y);

        }

    }
A.
12
B.
200
C.
400
D.
100

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

None.
12.

What is the output of this program?

    class box {

        int width;

        int height;

        int length;

        int volume;

        void volume() {

             volume = width*height*length;

        }

    }

        class Output {

        public static void main(String args[])

        {

            box obj = new box();

            obj.height = 1;

            obj.length = 5;

            obj.width = 5;

            obj.volume();

            System.out.println(obj.volume);

                }

    }
A.
0
B.
1
C.
25
D.
26

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
13.

What is the output of this program?

    class box {

        int width;

        int height;

        int length;

        int volume;

        void finalize() {

            volume = width*height*length;

            System.out.println(volume);

        }

        protected void volume() {

            volume = width*height*length;

            System.out.println(volume);

       }

    } 

       class Output {

        public static void main(String args[])

        { 

           box obj = new box();

           obj.width=5; 

           obj.height=5; 

           obj.length=6; 

           obj.volume();  

      }   

  }
A.
150
B.
200
C.
Run time error
D.
Compilation error

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

None.
14.

What is the output of this program?

   class overload {

        int x; double y;

        void add(int a , int b) {

            x = a + b;

        }

        void add(double c , double d){

            y = c + d;

        }

        overload() {

            this.x = 0;

            this.y = 0;

        } 

           } 

       class Overload_methods { 

       public static void main(String args[])  

      {  

          overload obj = new overload();

               int a = 2;

            double b = 3.2;

            obj.add(a, a);

            obj.add(b, b);

            System.out.println(obj.x + " " + obj.y);

             }

   }
A.
6 6
B.
6.4 6.4
C.
6.4 6
D.
4 6.4

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

For obj.add(a,a); ,the function in line number 4 gets executed and value of x is 4. For the next function call, the function in line number 7 gets executed and value of y is 6.4
15.

What is the output of this program?

    class static_out {

        static int x; static int y;

        void add(int a, int b){

            x = a + b;

            y = x + b;

        }

    }

        class static_use {

        public static void main(String args[])

        {

            static_out obj1 = new static_out();

            static_out obj2 = new static_out();

               int a = 2;

            obj1.add(a, a + 1);

            obj2.add(5, a);

            System.out.println(obj1.x + " " + obj2.y);

             }

   }
A.
7 7
B.
6 6
C.
7 9
D.
9 7

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
16.

What is the output of this program?

    class static_out {

        static int x; static int y;

        void add(int a , int b){

            x = a + b;

            y = x + b; 

       }

    }  

      class static_use {

        public static void main(String args[])

        { 

           static_out obj1 = new static_out();

            static_out obj2 = new static_out();

               int a = 2;

            obj1.add(a, a + 1);

            obj2.add(5, a);

            System.out.println(obj1.x + " " + obj2.y);

             } 

 }
A.
7 7
B.
6 6
C.
7 9
D.
9 7

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
17.

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());

        }

    }
A.
9
B.
10
C.
11
D.
12

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
18.

What is the output of this program?

    class A {

        public int i;

        private int j;

    }   

    class B extends A {

        void display() {

            super.j = super.i + 1;

            System.out.println(super.i + " " + super.j);

        }

    }   

    class inheritance {

        public static void main(String args[])

        {

            B obj = new B();

            obj.i=1;

            obj.j=2;  

            obj.display();    

        }

   }
A.
2 2
B.
3 3
C.
Runtime Error
D.
Compilation Error

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

class contains a private member variable j, this cannot be inherited by subclass B and does not have access to it.
19.

What is the output of this program?

   final class A {

         int i;

    }   

    class B extends A {

        int j;

        System.out.println(j + " " + i); 

    }   

    class inheritance {

        public static void main(String args[])

        {

            B obj = new B();

            obj.display();    

        }

   }
A.
2 2
B.
3 3
C.
Runtime Error
D.
Compilation Error

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

class A has been declared final hence it cannot be inherited by any other class. Hence class B does not have member i, giving compilation error.
20.

What is the output of this program?

   class A {

  int i;

  int j;

        A() {

            i = 1;

            j = 2;

        }

   }

   class Output {

        public static void main(String args[])

        {

             A obj1 = new A();

             A obj2 = new A();

       System.out.print(obj1.equals(obj2));

        }

   }
A.
false
B.
true
C.
1
D.
Compilation Error

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

obj1 and obj2 are two different objects. equals() is a method of Object class, Since Object class is superclass of every class it is available to every object.
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