shiyanshi.java

java编程150例

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

public class Shiyanshi extends JApplet
{
	JTree tree;
	JTextField jtf;
	
	public void init()
	{
		Container cp=getContentPane();
		cp.setLayout(new BorderLayout());
		
		DefaultMutableTreeNode top=new DefaultMutableTreeNode("杨扬");
		
		DefaultMutableTreeNode tx=new DefaultMutableTreeNode("图像");
		
		DefaultMutableTreeNode wy=new DefaultMutableTreeNode("wuyuan");
		tx.add(wy);
		DefaultMutableTreeNode lx=new DefaultMutableTreeNode("lixin");
		tx.add(lx);
		DefaultMutableTreeNode zyp=new DefaultMutableTreeNode("zhuyaoping");
		tx.add(zyp);
		
		DefaultMutableTreeNode wg=new DefaultMutableTreeNode("网格");
		
		DefaultMutableTreeNode lxd=new DefaultMutableTreeNode("lixiaodong");
		wg.add(lxd);
		DefaultMutableTreeNode cl=new DefaultMutableTreeNode("conglin");
		wg.add(cl);
		DefaultMutableTreeNode qjj=new DefaultMutableTreeNode("qiuzhuzhu");
		wg.add(qjj);
		
		top.add(tx);
		top.add(wg);
		
		tree=new JTree(top);
		
		int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
		int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
		
		JScrollPane jsp=new JScrollPane(tree,v,h);
		
		cp.add(jsp,BorderLayout.CENTER);
		
		jtf=new JTextField(20);
		cp.add(jtf,BorderLayout.SOUTH);
		tree.addMouseListener(new MouseAdapter()
		{
			public void mouseClicked(MouseEvent me)
			{
				doMouseClicked(me);
			}
		});		
		
	}
	
	void doMouseClicked(MouseEvent me)
	{
		TreePath tp=tree.getPathForLocation(me.getX(),me.getY());
		if(tp!=null) jtf.setText(tp.toString());
		else jtf.setText("");
	}
}