11、组合模式(Composite)

    xiaoxiao2021-12-10  6

    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

    看看关系图:

    直接来看代码:

    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!"); } }

    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。

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