public class Decorator {

public static void main(String agrs[]) {                    Greeting1 g = new AfterGreeting(new BeforeGreeting(new Greeting1Impl()));                    g.sayHello("king");        }

}

interface Greeting1 {

void sayHello(String name);

}

class Greeting1Impl implements Greeting1 {

public void sayHello(String name) {                    System.out.println("hello " + name);        }

}

abstract class DecoratorGreeting implements Greeting1 {

Greeting1 greeting1;        public DecoratorGreeting(Greeting1 g) {                    greeting1 = g;        }        @Override        public void sayHello(String name) {                    greeting1.sayHello(name);        }

}

class BeforeGreeting extends DecoratorGreeting {

public BeforeGreeting(Greeting1 g) {                    super(g);        }        @Override        public void sayHello(String name) {                    before();                    super.sayHello(name);        }        private void before() {                    System.out.println("before...");        }

}

class AfterGreeting extends DecoratorGreeting {

public AfterGreeting(Greeting1 g) {                    super(g);        }        @Override        public void sayHello(String name) {                    super.sayHello(name);                    after();        }        private void after() {                    System.out.println("after...");        }

}