Swing 之 JTree_jtree 把手-优快云博客

本文链接：https://blog.youkuaiyun.com/javazilu/article/details/70240022

本文介绍了一个使用 Java Swing 的 JTree 控件创建简单树形结构的例子。通过此示例了解如何构建树节点、设置树的各种属性及显示效果。

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package test;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;

public class Tree implements TreeSelectionListener {

public static void main(String[] args) {
  DefaultMutableTreeNode word = new DefaultMutableTreeNode("世界");
  DefaultMutableTreeNode country = new DefaultMutableTreeNode("国家");
  DefaultMutableTreeNode china= new DefaultMutableTreeNode("中国");
  DefaultMutableTreeNode usb = new DefaultMutableTreeNode("美国");
  DefaultMutableTreeNode beijing = new DefaultMutableTreeNode("北京");
  word.add(country);
  country.add(china);
  country.add(usb);
  china.add(beijing);
  //创建数据模型
  TreeModel model = new DefaultTreeModel(word);
  //构造一颗树
  JTree tree = new JTree(model);
  //隐藏根节点
   tree.setRootVisible(false);
  //双击该节点被编辑
   tree.setEditable(true);
   //带有根把手图标的树
  tree.setShowsRootHandles(true);
   //不带连接线的树
  // tree.putClientProperty("JTree.lineStyle", "None");   //不能用
  JScrollPane js=new JScrollPane(tree);
  JFrame jframe = new JFrame();
  jframe.add(js);
  jframe.setSize(200,300);
  jframe.setVisible(true);
}
}