simpletree.java~15~

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/**
 * <p>Title:SimpleTree </p>
 * <p>Description : 练习树型结构的使用</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company:  </p>
 * Date : 2006/2/11 15:13 PM
 * @author : Spring
 * @version 1.0
 */
//imports
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;

public class SimpleTree{
  public static void main(String[] args){
    //创建窗体
    JFrame frame = new SimpleTreeFrame();
    //设置点击退出窗口
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //显示窗口
    frame.show();
  }
}

class SimpleTreeFrame extends JFrame{
  public SimpleTreeFrame(){
    //设置标题栏
    setTitle("SimpleTree");
    //设置窗口区域
    setSize(WIDTH,HEIGHT);


    //创建根节点 世界
    DefaultMutableTreeNode root
        = new DefaultMutableTreeNode("World");
    //创建二层子节点 国家
    DefaultMutableTreeNode country
        = new DefaultMutableTreeNode("USA");
    //在根节点上添加子节点
    root.add(country);
    //创建三层节点 洲名
    DefaultMutableTreeNode state
        = new DefaultMutableTreeNode("California");
    //添加洲名
    country.add(state);

    //创建四层子节点 城市
    DefaultMutableTreeNode city
        = new DefaultMutableTreeNode("San Jose");
    //添加子节点 三个城市
    state.add(city);
    city = new DefaultMutableTreeNode("Cupertino");
    state.add(city);
    state = new DefaultMutableTreeNode("Michigan");
    country.add(state);
    city = new DefaultMutableTreeNode("Ann Arbor");
    state.add(city);

    country = new DefaultMutableTreeNode("Germany");
    root.add(country);
    state = new DefaultMutableTreeNode("Schleswig-Holstein");
    country.add(state);
    city = new DefaultMutableTreeNode("Kiel");
    state.add(city);

    JTree tree = new JTree(root);
    Container contentPane = getContentPane();
    contentPane.add(new JScrollPane(tree));
  }
  private static final int WIDTH = 300;
  private static final int HEIGHT = 200;

}