Java从入门到精通 - Swing树组件JTreeTest

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class JTreeTest  extends JFrame{

 public JTreeTest()
 {
  super();
  setTitle("Swing树组件");
  setBounds(100,100,350,150);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  DefaultMutableTreeNode root = new DefaultMutableTreeNode("根节点");
  DefaultMutableTreeNode nodeFirst = new DefaultMutableTreeNode("一级节点A");
  root.add(nodeFirst);
  //创建不允许有节点的二级节点
  DefaultMutableTreeNode nodeSecond = new DefaultMutableTreeNode("二级子节点",false);
  nodeFirst.add(nodeSecond);
  root.add(new DefaultMutableTreeNode("二级节点B"));
  JTree treeRoot = new JTree(root);
  getContentPane().add(treeRoot,BorderLayout.WEST);
     //利用根节点创建树模型，采用默认方法
  DefaultTreeModel treeModelDefault = new DefaultTreeModel(root);   //树模型,判断子结点
  JTree treeDefault = new JTree(treeModelDefault);
  getContentPane().add(treeDefault,BorderLayout.CENTER);
  //利用根节点创建模型,非默认方法：
  DefaultTreeModel treeModelPointed = new DefaultTreeModel(root,true); //树模型,不判断子结点
  JTree treePointed= new JTree(treeModelPointed);
  getContentPane().add(treePointed,BorderLayout.EAST);
 }
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  JTreeTest jTreeTest = new JTreeTest();
  jTreeTest.setVisible(true);
 }

}