Java final keyword

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    Question 1

    What is the use of final keyword in Java?

    • When a class is made final, a subclass of it can not be created.

    • When a method is final, it can not be overridden.

    • When a variable is final, it can be assigned value only once.

    • All of the above

    Question 2

    Output of following Java program Java 
    class Main {
 public static void main(String args[]){
   final int i;
   i = 20;
   System.out.println(i);
 }
}
    • 20
    • Compiler Error
    • 0
    • Garbage value

    Question 3

    Output of the below Java Code?

    Java 
    class Main {
 public static void main(String args[]){
    final int i;
    i = 20;
    i = 30;
    System.out.println(i);
 }
}


    • 30

    • Compiler Error

    • Garbage value

    • 0

    Question 4

    Output of the below Java Code?

    Java 
    class Base {
  public final void show() {
       System.out.println("Base::show() called");
    }
}
class Derived extends Base {
    public void show() {  
       System.out.println("Derived::show() called");
    }
}
public class Main {
    public static void main(String[] args) {
        Base b = new Derived();;
        b.show();
    }
}


    • Derived::show() called

    • Base::show() called

    • Compiler Error

    • Exception

    There are 4 questions to complete.

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