组合模式（Composite）-----基于JAVA语言

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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
例子:

   //节点类    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();          }      }    //表示一个树状结构    public class Tree {                TreeNode root = null;                public Tree(String name) {              root = new TreeNode(name);          }      }        //测试类    public class Test{        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!");          }    }

例如文件目录等存放,就可以用组合设计模式.

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