23种设计模式之组合模式代码实例

组合模式又叫部分整体模式，在处理类似树形结构的问题时常用。

    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;
        }  

        //添加孩子节点
        public void add(TreeNode node){
            children.add(node);
        }  

        //删除孩子节点
        public void remove(TreeNode node){
            children.remove(node);
        }  

        //取得孩子节点
        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 nodeB = new TreeNode("B");
            TreeNode nodeC = new TreeNode("C");  

            nodeB.add(nodeC);
            tree.root.add(nodeB);
            System.out.println("build the tree finished!");
        }
    }