JTree add and delete

Then small series on a simple introduction to making JTree, JTree below for simple add and delete options on display.

在这里插入代码片
import java.*;
import java.awt.*;
import java.awt.event.*;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;

public class Main1 extends JApplet{
	private JTree tree;
	public Main1() {
		tree=new JTree();
		add(tree);
		DefaultTreeCellRenderer cell=(DefaultTreeCellRenderer)      tree.getCellRenderer();//绘制器自定义
		cell.setBackgroundNonSelectionColor(Color.RED);
		cell.setOpenIcon(new ImageIcon("D:\\java1\\程序\\ai\\程序\\src\\lianxi\\a.jpg"));
	    tree.setCellEditor(new DefaultTreeCellEditor(tree,cell,new DefaultCellEditor(new JTextField())));//编译器自定义
		
	JButton button1=new JButton("删除文件");
	JButton button=new JButton(new AbstractAction("添加文件"){

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO 自动生成的方法存根
			DefaultMutableTreeNode a1=(DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
		String s=JOptionPane.showInputDialog("添加文件的名称");
		a1.add(new DefaultMutableTreeNode("s"));
		((DefaultTreeModel)(tree.getModel())).reload();
		}});
	JPanel pane=new JPanel();
	pane.add(button);
	pane.add(button1);
	add(pane,BorderLayout.SOUTH);
	button1.addActionListener(new ActionListener(){

		@Override
		public void actionPerformed(ActionEvent arg0) {
			// TODO 自动生成的方法存根
			DefaultMutableTreeNode a1=(DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
			a1.removeFromParent();
			((DefaultTreeModel)(tree.getModel())).reload();
			
		}});
	tree.setEditable(true);
	
	}
	
}