treedemo1.java

树(Tree)的使用

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

public class TreeDemo1{
public TreeDemo1(){
JFrame f=new JFrame("TreeDemo1");
Container contentPane=f.getContentPane();

String[] s1={"公司文件","个人信件","私人文件"}; 
String[] s2={"本机磁盘(C:)","本机磁盘(D:)","本机磁盘(E:)"};
String[] s3={"奇摩站","职棒消息","网络书店"};

Hashtable hashtable1=new Hashtable();
Hashtable hashtable2=new Hashtable();
hashtable1.put("我的公文包",s1);
hashtable1.put("我的电脑",s2);
hashtable1.put("收藏夹",hashtable2);
hashtable2.put("网站列表",s3);

Font font = new Font("Dialog", Font.PLAIN, 12);
Enumeration keys = UIManager.getLookAndFeelDefaults().keys();
/**定义widnows界面**/
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
//System.out.println(key.toString());
if (UIManager.get(key) instanceof Font) {
UIManager.put(key, font);
}
} 
try{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}catch(Exception el){
System.exit(0);
}
/**定义widnows界面**/
JTree tree=new JTree(hashtable1);
JScrollPane scrollPane=new JScrollPane();
scrollPane.setViewportView(tree);
contentPane.add(scrollPane);
f.pack();
f.setVisible(true);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0); 
}
});
} 
public static void main(String[] args){
new TreeDemo1();
}
}