GeezerVison

/** * Interface Example One * */ public class Main { public static void main(String[] args) { // new Animal(); // Not Allowed. Animal animal = new Dog(); animal.eat(); animal.run(); } } interface Animal { public static final float pi = 3.14f; abstract public void run(); abstract public void eat(); } class Dog implements Animal { @Override public void run() { System.out.println("Dog is running"); } @Override public void eat() { System.out.println("Dog is eating"); } } /* * Rules of Interface * * You cannot create object of interface. They are just a blueprint of a class. * * Use implements keyword * * They can only contain abstract methods. * * 1. For Methods * * They are public and abstract * * No method body. You cannot write code within your method. * * 2. For Variables * * Avoid using field variables * * But when used they are constants. Their values cannot be changed once defined. * * They are public, static and final * * */