二十三种设计模式全面解析-组合模式与迭代器模式的结合应用：构建灵活可扩展的对象结构

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
interface Component {
    void operation();
}
class Leaf implements Component {
    private String name;
    public Leaf(String name) {
        this.name = name;
    }
    @Override
    public void operation() {
        System.out.println("执行叶子对象 " + name + " 的操作");
    }
}
class Composite implements Component {
    private List<Component> components = new ArrayList<>();
    public void addComponent(Component component) {
        components.add(component);
    }
    public void removeComponent(Component component) {
        components.remove(component);
    }
    @Override
    public void operation() {
        System.out.println("执行组合对象的操作");
        for (Component component : components) {
            component.operation();
        }
    }
    public Iterator<Component> iterator() {
        return components.iterator();
    }
}
public class Client {
    public static void main(String[] args) {
        Component leaf1 = new Leaf("Leaf 1");
        Component leaf2 = new Leaf("Leaf 2");
        Composite composite = new Composite();
        composite.addComponent(leaf1);
        composite.addComponent(leaf2);
        composite.operation();
        System.out.println("使用迭代器遍历组合对象:");
        Iterator<Component> iterator = composite.iterator();
        while (iterator.hasNext()) {
            Component component = iterator.next();
            component.operation();
        }
    }
}