final-keywords

package keyword;

public class keywordFinal
{
    public static void main(String[] args)
    {
        ClassA clA = new ClassA(20, 90);
        clA.dispFinal();
        clA.dispMyInt();

        CLassB clB = new CLassB();
        clB.setMyInt(50);
        clB.dispMyInt();
    }
}

// OUTPUT

//The value of final variable : 20
//The value MyInt : 90
//The value of MyInt for Class B : 50

package keyword;

class ClassA
{
    final int finInteger;
    protected int myInt;
    public ClassA(int x, int y)
    {
        finInteger = x; // initialize for only one time
        myInt = y;
    }

    public ClassA()
    {
        this(0, 0);
    }

    final public void dispFinal() // final methods can not be overriden
    {
        System.out.println("The value of final variable : "+ finInteger);
    }

    public void dispMyInt()
    {
        System.out.println("The value MyInt : "+ myInt);
    }
}

final class CLassB extends ClassA // final class will not be extended
{
    protected int myInt;
    public void setMyInt(int x)
    {
        myInt = x;
    }

    public void dispMyInt() // overriden method
    {
        System.out.println("The value of MyInt for Class B : "+ myInt);
    }
}