以下示例展示了如何在Java Swing应用程序中创建树。

使用以下API -

• JTree(root)- 创建树。
• DefaultMutableTreeNode() - 创建树节点。
• DefaultMutableTreeNode().add(node) - 将树节点添加到树节点。

示例

package com.yiibai.swingdemo;

import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;

public class SwingTester {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingTester(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingTester swingControlDemo = new SwingTester();      
      swingControlDemo.showTableDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Swing创建树示例(yiibai.com)");
      mainFrame.setSize(500,600);
      mainFrame.setLayout(new GridLayout(3, 1));

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,200);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showTableDemo(){
      headerLabel.setText("Control in action: JTree"); 
      // Create a root tree item as department
      DefaultMutableTreeNode department = new DefaultMutableTreeNode("部门管理");

      //create other tree items as department names
      DefaultMutableTreeNode salesDepartment = new DefaultMutableTreeNode("销售部");
      DefaultMutableTreeNode marketingDepartment = new DefaultMutableTreeNode("市场部");
      DefaultMutableTreeNode manufacturingDepartment = new DefaultMutableTreeNode("制造部");

      //create other tree items as employees
      DefaultMutableTreeNode employee1 = new DefaultMutableTreeNode("张三");
      DefaultMutableTreeNode employee2 = new DefaultMutableTreeNode("李车车");
      DefaultMutableTreeNode employee3 = new DefaultMutableTreeNode("王小达");

      //add employees to sales department
      salesDepartment.add(employee1);
      salesDepartment.add(employee2);
      salesDepartment.add(employee3);

      //create other tree items as employees
      DefaultMutableTreeNode employee4 = new DefaultMutableTreeNode("马花花");
      DefaultMutableTreeNode employee5 = new DefaultMutableTreeNode("黄小木");


      //add employees to marketing department
      marketingDepartment.add(employee4);
      marketingDepartment.add(employee5);      

      //create other tree items as employees
      DefaultMutableTreeNode employee6 = new DefaultMutableTreeNode("周琳");
      DefaultMutableTreeNode employee7 = new DefaultMutableTreeNode("易周");

      //add employees to sales department
      manufacturingDepartment.add(employee6);
      manufacturingDepartment.add(employee7);

      //add departments to department item
      department.add(salesDepartment);
      department.add(marketingDepartment);
      department.add(manufacturingDepartment);

      //create the tree with department as root node
      JTree tree = new JTree(department);
      JScrollPane treeView = new JScrollPane(tree);
      controlPanel.add(treeView);

      mainFrame.setVisible(true);     
   } 
}

执行上面示例代码，得到以下结果：

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