worldintroduction.java

利用树形结构对几个国家的省和主要城市进行介绍。

//2005-11-2

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


public class WorldIntroduction
{
   public static void main(String[] args)
   {
      JFrame frame = new World();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}


class World extends JFrame
{
   public World()
   {
      setTitle("国家介绍");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // set up tree model data

      DefaultMutableTreeNode root = new DefaultMutableTreeNode("世界");

      DefaultMutableTreeNode country = new DefaultMutableTreeNode("美国");
      root.add(country);
      DefaultMutableTreeNode state = new DefaultMutableTreeNode("加利福尼亚");
      country.add(state);
      DefaultMutableTreeNode city = new DefaultMutableTreeNode("休斯敦");
      state.add(city);
      city = new DefaultMutableTreeNode("洛杉矶");
      state.add(city);

      state = new DefaultMutableTreeNode("密歇根");
      country.add(state);


      country = new DefaultMutableTreeNode("德国");
      root.add(country);
      state = new DefaultMutableTreeNode("慕尼黑");
      country.add(state);
      state = new DefaultMutableTreeNode("柏林");
      country.add(state);

      country = new DefaultMutableTreeNode("中国");
	  root.add(country);
	  state = new DefaultMutableTreeNode("北京");
	  country.add(state);
	  city = new DefaultMutableTreeNode("朝阳区");
      state.add(city);
      city = new DefaultMutableTreeNode("海淀区");
      state.add(city);
      city = new DefaultMutableTreeNode("大兴区");
      state.add(city);
      city = new DefaultMutableTreeNode("房山区");
      state.add(city);
      state = new DefaultMutableTreeNode("天津");
	  country.add(state);
	  city = new DefaultMutableTreeNode("河东区");
	  state.add(city);
	  city = new DefaultMutableTreeNode("河西区");
      state.add(city);
	  state = new DefaultMutableTreeNode("上海");
	  country.add(state);
	  country = new DefaultMutableTreeNode("韩国");
	  root.add(country);
	  state = new DefaultMutableTreeNode("汉城");
	  country.add(state);
	  country = new DefaultMutableTreeNode("日本");
	  root.add(country);
	  state = new DefaultMutableTreeNode("东京");
	  country.add(state);
	  state = new DefaultMutableTreeNode("大坂");
	  country.add(state);


      JTree tree = new JTree(root);
      Container contentPane = getContentPane();
      contentPane.add(new JScrollPane(tree));
   }

   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 300;
}