组合模式java代码示例

下面是一个简单的 Java 代码示例，演示了如何使用组合模式：

import java.util.ArrayList;
import java.util.List;

// 定义组件接口
interface Component {
    void show();
}

// 定义叶子节点
class Leaf implements Component {
    private String name;

    public Leaf(String name) {
        this.name = name;
    }

    @Override
    public void show() {
        System.out.println(name);
    }
}

// 定义组合节点
class Composite implements Component {
    private String name;
    private List<Component> children = new ArrayList<>();

    public Composite(String name) {
        this.name = name;
    }

    public void add(Component component) {
        children.add(component);
    }

    @Override
    public void show() {
        System.out.println(name);
        for (Component component : children) {
            component.show();
        }
    }
}

// 测试代码
public class CompositePatternDemo {
    public static void main(String[] args) {
        // 创建组合节点
        Composite root = new Composite("root");
        Composite branch1 = new Composite("branch1");
        Composite branch2 = new Composite("branch2");

        // 创建叶子节点
        Leaf leaf1 = new Leaf("leaf1");
        Leaf leaf2 = new Leaf("leaf2");
        Leaf leaf3 = new Leaf("leaf3");

        // 组装节点
        root.add(branch1);
        root.add(branch2);
        branch1.add(leaf1);
        branch2.add(leaf2);
        branch2.add(leaf3);

        // 展示节点
        root.show();
    }
}

运行结果：

root
branch1
leaf1
branch2
leaf2
leaf3