十五 设计模式之组合模式

//抽象构件
public abstract class Component {
//个体和整体都具有的共享
public void operation(){
//doSomething
}
}
//树枝构件
public class Composite extends Component {
private ArrayList<Component> componentArrayList = new ArrayList<Component>();
public void Add(Component param) {
this.componentArrayList.add(param);
}
public void Remove(Component param) {
this.componentArrayList.remove(param);
}
public  ArrayList<Component> GetChild() {
return this.componentArrayList;
}
}
//树叶构件
public class Leaf extends Component {
}
//场景类
public class Client {
public static void main(String args[]){
//创建一个根节点
Composite root = new Composite();
root.operation();
Composite branch = new Composite();
Leaf leaf = new Leaf();
root.Add(branch);
root.Add(leaf);
}
public static void display(Composite root){
for(Component c:root.GetChild()){
if(c instanceof Leaf){
c.operation();
}else{
display((Composite)c);
}
}
}
}