下面就是一个找包中Class的，你看看
package studytest;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/
import java.awt.*;
import java.awt.event.*;
import java.lang.reflect.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class ClassTree {
public static void main(String[] args) {
JFrame frame=new ClassTreeFrame();
frame.show();
}
}
class ClassTreeFrame extends JFrame implements ActionListener
{
private DefaultMutableTreeNode root;
private DefaultTreeModel model;
private JTree tree;
private JTextField textField;
public ClassTreeFrame()
{
setTitle("Class Tree");
setSize(300,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
root=new DefaultMutableTreeNode(java.lang.Object.class);
model=new DefaultTreeModel(root);
tree=new JTree(model);
addClass(getClass());
ClassNameTreeCellRenderer renderer=new ClassNameTreeCellRenderer();
renderer.setClosedIcon(new ImageIcon("C:\\1.gif"));
renderer.setOpenIcon(new ImageIcon("C:\\3.gif"));
renderer.setLeafIcon(new ImageIcon("C:\\2.gif"));
tree.setCellRenderer(renderer);
Container contentPane=getContentPane();
contentPane.add(new JScrollPane(tree),"Center");
textField=new JTextField();
textField.addActionListener(this);
contentPane.add(textField,"South");
}
public void actionPerformed(ActionEvent event)
{
try
{
String text=textField.getText();
addClass(Class.forName(text));
textField.setText("");
}
catch(ClassNotFoundException e)
{
Toolkit.getDefaultToolkit().beep();
}
}
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;
Class s=c.getSuperclass();
DefaultMutableTreeNode parent;
if(s==null)
parent=root;
else
parent=addClass(s);
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(c);
model.insertNodeInto(newNode,parent,parent.getChildCount());
TreePath path=new TreePath(model.getPathToRoot(newNode));
tree.makeVisible(path);
return newNode;
}
}
class ClassNameTreeCellRenderer extends DefaultTreeCellRenderer
{
private Font plainFont=null;
private Font italicFont=null;
public Component getTreeCellRendererComponent(JTree tree,Object value,boolean selected,boolean expanded,boolean leaf,int row,boolean hasFocus)
{
super.getTreeCellRendererComponent(tree,value,selected,expanded,leaf,row,hasFocus);
DefaultMutableTreeNode node=(DefaultMutableTreeNode)value;
Class c=(Class)node.getUserObject();
if(plainFont==null)
{
plainFont=getFont();
if(plainFont!=null)
italicFont=plainFont.deriveFont(Font.ITALIC);
}
if((c.getModifiers()&Modifier.ABSTRACT)==0)
setFont(plainFont);
else
setFont(italicFont);
return this;
}
}
