设计模式随笔之组合模式（Composite）

组合模式有时又叫部分-整体模式在处理类似树形结构的问题时比较方便。

代码如下：

public class TreeNode { private String name; private TreeNode parent; private Vector<TreeNode> children = new Vector<TreeNode>(); public TreeNode(String name){ this.name=name; } public String getName() { return name; } public void setName(String name) { this.name = name; } public TreeNode getParent() { return parent; } public void setParent(TreeNode parent) { this.parent = parent; } public void addchild(TreeNode child){ children.add(child); } public void delchild(TreeNode child){ children.remove(child); } public Enumeration<TreeNode> getChildren(){ return children.elements(); } }

public class Tree { TreeNode root=null; public Tree(String name){ root = new TreeNode(name); } public static void main(String[] args) { Tree tree =new Tree("A"); TreeNode treenodeB = new TreeNode("B"); TreeNode treenodeC = new TreeNode("C"); treenodeB.addchild(treenodeC); tree.root.addchild(treenodeB); System.out.println("build tree finished"); } } 使用场景：将多个对象组合在一起进行操作，常用于表示树形结构中，例如二叉树，数等。