50 Java Language MCQs with Answers

Question 11

Output of following Java program?

C

class Test
{
    public static void main (String[] args) 
    {
        int arr1[] = {1, 2, 3};
        int arr2[] = {1, 2, 3};
        if (arr1 == arr2) 
            System.out.println(\"Same\");
        else
            System.out.println(\"Not same\");
    }
}

• Same
• Not Same

Question 12

Java

class Test {
   public static void main(String args[]) {
     int arr[] = new int[2];  
     System.out.println(arr[0]);
     System.out.println(arr[1]);
   }
}

• 0
  0

• garbage value
  garbage value

• Compiler Error
• Exception

Question 13

Java

class Test
{
    public static void main (String[] args) 
    {
        int arr1[] = {1, 2, 3};
        int arr2[] = {1, 2, 3};
        if (arr1.equals(arr2))
            System.out.println(\"Same\");
        else
            System.out.println(\"Not same\");
    }
}

• Same
• Not same

Question 14

Predict the output?

Java

// file name: Main.java
public class Main {
    public static void main(String args[]) {
       int arr[] = {10, 20, 30, 40, 50};
       for(int i=0; i < arr.length; i++)
       {
             System.out.print(\" \" + arr[i]);              
       }
    }
}

• 10 20 30 40 50
• Compiler Error
• 10 20 30 40

Question 15

Which of the following is FALSE about arrays in Java?

• A java array is always an object

• Length of array can be changed after creation of array

• Arrays in Java are always allocated on heap

Question 16

C

class Main { 
 public static void main(String args[]) { 
         int t; 
         System.out.println(t); 
    } 
}

• 0
• garbage value
• compiler error
• runtime error

Question 17

Predict the output of following Java program.

C

class Test { 
    public static void main(String[] args) { 
      for(int i = 0; 0; i++) 
      { 
          System.out.println(\"Hello\"); 
          break; 
      } 
    } 
} 

• Hello
• Empty Output
• Compiler error
• Runtime error

Question 18

Predict the output of the following program.

Java

 class Test
{
    public static void main(String[] args)
    {
        Double object = new Double(\"2.4\");
        int a = object.intValue();
        byte b = object.byteValue();
        float d = object.floatValue();
        double c = object.doubleValue();

        System.out.println(a + b + c + d );

    }
}

• 8
• 8.8
• 8.800000095367432

Question 19

Which of the following statements is/are TRUE regarding JAVA ? (a) Constants that cannot be changed are declared using the ‘static’ keyword. (b) A class can only inherit one class but can implement multiple interfaces.

• Only (a) is TRUE.
• Only (b) is TRUE.
• Both (a) and (b) are TRUE.
• Neither (a) nor (b) are TRUE.

Question 20

JAVA

class Test
{
    static int a;
    
    static
    {
        a = 4;
        System.out.println (\"inside static block\\n\");
        System.out.println (\"a = \" + a);
    }
    
    Test()
    {
        System.out.println (\"\\ninside constructor\\n\");
        a = 10;
    }
    
    public static void func()
    {
        a = a + 1;
        System.out.println (\"a = \" + a);
    }
    
    public static void main(String[] args)
    {

        Test obj = new Test();
        obj.func();

    }
}
 

• inside static block
  a = 4
  inside constructor
  a = 11

• Compiler Error
• Run Time Error
• inside static block
  a = 4
  inside constructor
  a = 5
  

• inside static block
  a = 10
  inside constructor
  a = 11