java设计模式之组合模式(Composite)

import java.util.ArrayList;import java.util.List;abstract class Component {  protected String name;  public Component(String name) {    this.name = name;  }  public abstract void Add(Component c);  public abstract void Remove(Component c);  public abstract void GetChild(int depth);}class Leaf extends Component {  public Leaf(String name) {    super(name);  }  @Override  public void Add(Component c) {    System.out.println("Can not add to a leaf");  }  @Override  public void Remove(Component c) {    System.out.println("Can not remove from a leaf");  }  @Override  public void GetChild(int depth) {    String temp = " ";    for (int i = 0; i < depth; i++) {      temp += "-";      System.out.println(temp + name);    }  }}class Composite extends Component {  private List<Component> children = new ArrayList<>();  public Composite(String name) {    super(name);  }  @Override  public void Add(Component c) {    children.add(c);  }  @Override  public void Remove(Component c) {    children.remove(c);  }  @Override  public void GetChild(int depth) {    for (Component c : children) {      c.GetChild(depth);    }  }}public class Main {  public static void main(String args[]) {    Composite root = new Composite("root");    root.Add(new Leaf("Leaf A"));    root.Add(new Leaf("Leaf B"));    Composite compX = new Composite("Composite X");    compX.Add(new Leaf("Leaf XA"));    compX.Add(new Leaf("Leaf XB"));    root.Add(compX);    Composite compXY = new Composite("Composite XY");    compXY.Add(new Leaf("Leaf XYA"));    compXY.Add(new Leaf("Leaf XYB"));    compX.Add(compXY);    root.GetChild(3);  }}