classbrowsertest.java~23~

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

public class ClassBrowserTest{
  public static void main(String [] args){
    JFrame frame = new ClassBrowserTestFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.show();
  }
}

class ClassBrowserTestFrame extends JFrame{
  public ClassBrowserTestFrame(){
    setTitle("ClassBrowserTestFrame");
    setSize(WIDTH,HEIGHT);
    //创建根节点与树状样式
    root = new DefaultMutableTreeNode(java.lang.Object.class);
    model = new DefaultTreeModel(root);
    tree = new JTree(model);
    addClass(getClass());
    tree.addTreeSelectionListener(new TreeSelectionListener(){
        public void valueChanged(TreeSelectionEvent event){
           TreePath path = tree.getSelectionPath();
           if( path == null) return;
        DefaultMutableTreeNode selectedNode
            = (DefaultMutableTreeNode)path.getLastPathComponent();
        Class c = (Class)selectedNode.getUserObject();
        String description = getFieldDescription(c);
        textArea.setText(description);
        }
   });
    int mode = TreeSelectionModel.SINGLE_TREE_SELECTION;
    tree.getSelectionModel().setSelectionMode(mode);
    textArea = new JTextArea();

    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(1,2));
    panel.add(new JScrollPane(tree));
    panel.add(new JScrollPane(textArea));
    getContentPane().add(panel,BorderLayout.CENTER);
    addTextField();
  }

  public void addTextField(){
     JPanel panel = new JPanel();
     ActionListener addListener = new ActionListener(){
       public  void actionPerformed(ActionEvent event){
         try{
           String text = textField.getText();
           addClass(Class.forName(text));
           textField.setText("");
         }

         catch(ClassNotFoundException e){
            JOptionPane.showMessageDialog(null,"Class not found");
         }
      }
     };
     textField = new JTextField(20);
     textField.addActionListener(addListener);
     panel.add(textField);

     JButton addButton = new JButton("Add");
     addButton.addActionListener(addListener);
     panel.add(addButton);
     getContentPane().add(panel,BorderLayout.SOUTH);
  }

  public DefaultMutableTreeNode findUserObject(Object obj){
     Enumeration e = root.breadthFirstEnumeration();
     while(e.hasMoreElements()){
       DefaultMutableTreeNode node
           =(DefaultMutableTreeNode)e.nextElement();
       if(node.getUserObject().equals(obj))
         return node;
     }
     return null;
  }

  public DefaultMutableTreeNode addClass(Class c){
    if(c.isInterface() ||c.isPrimitive())
      return null;
    DefaultMutableTreeNode node = findUserObject(c);
    if(node !=null)
       return node;
  //获得该类的超类，如果它没有父类，它就是根节点
   Class s = c.getSuperclass();
   DefaultMutableTreeNode parent;
   if(s == null)
     parent = root;
   else
    parent = addClass(s);
    DefaultMutableTreeNode newNode
       = new DefaultMutableTreeNode(c);

   //显示插入的节点
   model.insertNodeInto(newNode,parent,parent.getChildCount());
   TreePath path = new TreePath(model.getPathToRoot(newNode));
   tree.makeVisible(path);
   return newNode;
  }

  public static String getFieldDescription(Class c){
    StringBuffer r = new StringBuffer();
    Field[] fields = c.getDeclaredFields();
    for(int i = 0;i< fields.length;i++){
      Field f= fields[i];
      if((f.getModifiers() & Modifier.STATIC) !=0)
        r.append(f.getType().getName());
        r.append(" ");
        r.append(f.getName());
        r.append("\n");
    }
    return r.toString();
  }

 private DefaultMutableTreeNode root;
 private DefaultTreeModel model;
 private JTree tree;
 private JTextField textField;
 private JTextArea textArea;
 private static final int WIDTH = 400;
 private static final int HEIGHT = 300;

}