Java final keyword

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Question 1

What is the use of final keyword in Java?

A
When a class is made final, a subclass of it can not be created.
B
When a method is final, it can not be overridden.
C
When a variable is final, it can be assigned value only once.
D
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);
 }
}

A
20
B
Compiler Error
C
0
D
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);
 }
}

A
30
B
Compiler Error
C
Garbage value
D
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();
    }
}

A
Derived::show() called
B
Base::show() called
C
Compiler Error
D
Exception

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