mainframe.java

一个用swing做的java树

//MainFrame.java
//演示怎样显示现实的用户和用户组数据

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import javax.swing.tree.*;

public class MainFrame extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JScrollPane jScrollPane1 = new JScrollPane();

  Vector userData=new Vector();
  Vector groupData=new Vector();

  JTree tree ;

  /**Construct the frame*/
  public MainFrame() {

    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]")));
     initTree();
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Demo how to use JTree");
    contentPane.add(jScrollPane1, BorderLayout.CENTER);
    jScrollPane1.getViewport().add(tree, null);

  }
  /**Overridden so we can exit when window is closed*/
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void initDataSource(){
    for (int i=0;i<5;i++){
      userData.addElement("User"+i);
      groupData.addElement("Group"+i);
    }
  }
  void initTree(){
    initDataSource();

    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Root");
    tree=new JTree(top);

    DefaultMutableTreeNode groups = new DefaultMutableTreeNode("Groups");
    DefaultMutableTreeNode users = new DefaultMutableTreeNode("Users");
    for (int i=0;i<groupData.size();i++){
      DefaultMutableTreeNode leaf = new DefaultMutableTreeNode((String)groupData.elementAt(i));
      groups.add(leaf);
    }
    top.add(groups);
    for (int i=0;i<userData.size();i++){
      DefaultMutableTreeNode leaf = new DefaultMutableTreeNode((String)userData.elementAt(i));
      users.add(leaf);
    }
    top.add(users);
//    tree.setShowsRootHandles(true);
  }

  public static void main(String[] args){
    MainFrame frame=new MainFrame();
    frame.show();

  }
}