设计 模式

public class Composite extends Component{
	private List<Component> components = new ArrayList<>();
	
	public void add(Component component){
		components.add(component);
	}
	
	public List<Component> getChildren(){
		return this.components;
	}
}

public abstract class Decorator extends Component{
	private Component component =null;
	private Decorator(Component _component){
		this.component=_component;
	}
	
	public void operate(){
		this.component.operate();
	}
}
public ConcreteDecorator extends Decorator{
	public ConcreteDecorator(Component _component){
		super(_component)
	}
	
	private method(){
		...
	}
	
	public void operate(){
		this.method();
		super.operate();
	}
}

public abstract class Abstract{
	private Implementor imp;
	private Abstract(Implementor _imp){
		this.imp=_imp;
	}
	
	public void request(){
		this.imp.doSomething();
	}
}