usejtree.java

精通Java核心技术源代码

// ==================== Program Discription =====================
// 程序名称：示例3-1 : UseJTree .java
// 程序目的：学习使用Jtree
// ==============================================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.Component;
import java.awt.Window;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class UseJTree extends JFrame {

  public UseJTree() {
    super("JTree使用举例");
    setSize(400, 300);
    addWindowListener(new WindowAdapter(){
    	 public void windowClosing(WindowEvent windowevent)
		    {
		        Window window = windowevent.getWindow();
		        window.dispose();
		        System.exit(0);
		    }
    });
  }

  public void init()
  {
    /**这里主要是初始化JTree的操作，使用DefaultTreeModel可以构建一棵完整的JTree*/
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("管理");//树节点的根
    
    DefaultMutableTreeNode subroot_1_1 = new DefaultMutableTreeNode("人员管理");//一级子节点
    DefaultMutableTreeNode subroot_2_1 = new DefaultMutableTreeNode("财务管理");//一级子节点
    
    DefaultMutableTreeNode subroot_3_1 = new DefaultMutableTreeNode("市场部");//二级子节点
    DefaultMutableTreeNode subroot_3_2 = new DefaultMutableTreeNode("项目工程部");//二级子节点
    DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("张小军");//树节点的叶
    DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("李米");//树节点的叶
    
    DefaultMutableTreeNode subroot_4_1 = new DefaultMutableTreeNode("月末报表");//二级子节点
    DefaultMutableTreeNode subroot_4_2 = new DefaultMutableTreeNode("工资管理");//二级子节点
    
    DefaultMutableTreeNode leaf3 = new DefaultMutableTreeNode("王津");//树节点的叶
    DefaultMutableTreeNode leaf4 = new DefaultMutableTreeNode("王兵");//树节点的叶
    
    treeModel = new DefaultTreeModel(root);
    tree = new JTree(treeModel);

    /**以下的操作是构建一棵树的操作*/
    treeModel.insertNodeInto(subroot_1_1, root, 0);
    treeModel.insertNodeInto(subroot_2_1, root, 1);
    
    treeModel.insertNodeInto(subroot_3_1, subroot_1_1, 0);
    treeModel.insertNodeInto(subroot_3_2, subroot_1_1, 1);
    
    treeModel.insertNodeInto(leaf1, subroot_3_2, 0);
    treeModel.insertNodeInto(leaf2, subroot_3_1, 0);
    
    treeModel.insertNodeInto(subroot_4_1, subroot_2_1, 0);
    treeModel.insertNodeInto(subroot_4_2, subroot_2_1, 1);
    
    treeModel.insertNodeInto(leaf3, subroot_4_2, 0);
    treeModel.insertNodeInto(leaf4, subroot_4_2, 1);     

    // 显示整棵树
    getContentPane().add(tree, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    UseJTree jtree = new UseJTree();
    jtree.init();
    jtree.setVisible(true);
  }
  
  JTree tree;
  DefaultTreeModel treeModel;

}