JAVA实现无限级水果分类

JAVA实现无限级水果分类
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import javax.swing.event.*;
import java.io.*;

//主框架类
public class Fruit extends javax.swing.JFrame
{
    public Fruit()
    {
        JFrame f = new JFrame("水果");                
       
        String[] s1 = {"西瓜","西红柿","椰子","香蕉"};
        String[] s2 = {"草莓","梨","青苹果"};
        String[] s3 = {"黑枣","榴莲"};
        String[] s4 = {"番石榴","桔子","荔枝","葡萄","桃子"};
        Hashtable hashtable1 = new Hashtable();
        hashtable1.put("寒性水果",s1);
        hashtable1.put("凉性水果",s2);
        hashtable1.put("热性水果",s3);
        hashtable1.put("温性水果",s4);
        //用hashtable方法构建树形结构
        tree1 = new JTree(hashtable1);
       
        //设置树结点响应监听事件
        tree1.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
            public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
                valueChange1(evt);
            }
        });
       
        //用JScrollPane实现Tree结构的可拉伸扩展
        scrollPane1=new JScrollPane(tree1);
        Container contentPane = f.getContentPane();
       
        //label1显示图片
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        scrollPane2 = new JScrollPane(editorPane);
       
        //设置editorPane是不可修改的
        editorPane.setEditable(false);

        /**以splitPane2中包含splitPane1,再用splitPane1包含label1和scrollPane2的内容
        **实现界面三分的结构**/
       
        //设置splitPane1是垂直分布,并且是不可再分的,包含label1和scrollPane2
        splitPane1 = new JSplitPane(JSplitPane.VERTICAL_SPLIT,false,label1,scrollPane2);
        splitPane1.setDividerLocation(200);
        splitPane1.setOneTouchExpandable(false);
        splitPane1.setDividerSize(10);
       
        //设置splitPane2是水平分布,是可再分的,包含scrollPane1和splitPane1
        splitPane2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scrollPane1,splitPane1);
        splitPane2.setDividerLocation(130);
        splitPane2.setOneTouchExpandable(false);
        splitPane2.setDividerSize(5);       

        contentPane.add(splitPane2);

        f.setSize(400,500);//设置容器大小
        f.show();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                    System.exit(0);
            }       
        
        /**用valueChange1实现对结点事件的响应,将棋实例化
         **/
        private void valueChange1(javax.swing.event.TreeSelectionEvent evt) {     
        DefaultMutableTreeNode  selectionNode=(DefaultMutableTreeNode)tree1.getLastSelectedPathComponent();
       
            //显示图片
            try{
             
            String  nodename=selectionNode.toString();
        
            label1.setIcon(new ImageIcon("pic/"+nodename+".jpg"));
         
            System.out.println(nodename+".jpg");
            String filepath = "file:"+System.getProperty("user.dir")  +System.getProperty("file.separator") +
                              nodename+".txt";
            //显示文本到editorPane
            try {
                 editorPane.setPage(filepath);
            } catch(IOException ex) {
                 System.out.println("找不到此文件");
            }
           
            }
           
        catch(NullPointerException  exc){}

    }

    //主函数
    public static void main(String[] arg)
    {

          new Fruit();
 
    }
    //变量声名
    private javax.swing.JLabel label1;
    private javax.swing.JPanel panel1;
    private javax.swing.JSplitPane splitPane1,splitPane2;
    private javax.swing.JScrollPane  scrollPane1,scrollPane2,scrollPane3;
    private javax.swing.JTree tree1;
    private javax.swing.JEditorPane editorPane;  
}516