Java Program using abstract class and interface

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In this program, You will learn how to implement abstract class and interface in java.

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interface Clerk { 
   //declaration
}

abstract class Peon implements Clerk { 
   //statement
}

class Admin extends Peon { 
    //statement
}

Example: How to implement abstract class and interface in java.

interface Clerk {
    int csal = 10000;
}

abstract class Peon implements Clerk {
    int psal = 8000;
    abstract void add();
}

class Main extends Peon {

    int tsal;

    void add() {
        tsal = csal + psal;
        System.out.println("Clerk Salary is :" + csal);
        System.out.println("Peon Salary is :" + psal);
        System.out.println("Total Salary is :" + tsal);
    }

    public static void main(String args[]) {
        Main ad = new Main();
        ad.add();
    }
}

Output:

Clerk Salary is :10000
Peon Salary is :8000
Total Salary is :18000