设计模式之装饰模式

Component

public interface Component {
	public void doSomething();
}

ConcreteComponent

public class ConcreteComponent implements Component {

	@Override
	public void doSomething() {
		System.out.println("Function ");
	}

}

Decorator

public class Decorator implements Component {

	private Component component;
	
	public Decorator(Component component){
		this.component = component;
	}
	
	@Override
	public void doSomething() {
		this.component.doSomething();
	}
}

ConcreteDecorator1

public class ConcreteDecorator1 extends Decorator {

	public ConcreteDecorator1(Component component) {
		super(component);
	}
	
	@Override
	public void doSomething(){
		super.doSomething();
		doAnotherthing();
	}
	
	private void doAnotherthing(){
		System.out.println("Function 1");
	}

}

ConcreteDecorator2

public class ConcreteDecorator2 extends Decorator {

	public ConcreteDecorator2(Component component) {
		super(component);
	}
	
	@Override
	public void doSomething(){
		super.doSomething();
		doAnotherthing();
	}
	
	private void doAnotherthing(){
		System.out.println("Function 2");
	}

}

Client

public class Client {

	public static void main(String[] args) {
		Component component = new ConcreteComponent();
		
		Component component2 = new ConcreteDecorator1(component);
		
		Component component3 = new ConcreteDecorator2(component2);
		
		component3.doSomething();
	}

}