import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class TestJTree extends JFrame {

    private JButton button ;
    private JTree tree ;
    private int treeNodeNum = 1 ;
    DefaultMutableTreeNode _rootNode = new DefaultMutableTreeNode("root");
    DefaultTreeModel _defaultTreeModel = new DefaultTreeModel(_rootNode);
    
    public TestJTree(){
        super();
        this.setSize(300, 400);
        button = new JButton("添加树节点");
        button.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                DefaultMutableTreeNode _newNode = new DefaultMutableTreeNode("新添加的树节点_"+treeNodeNum);
                _rootNode.add(_newNode);
                _defaultTreeModel.reload();
                treeNodeNum++;
            }
        });
        
        tree = new JTree();
        
        tree.setModel(_defaultTreeModel);
        
        this.getContentPane().add(tree,BorderLayout.CENTER);
        this.getContentPane().add(button,BorderLayout.SOUTH);
    }
    
    
    public static void main(String[] args){
        TestJTree testJTree = new TestJTree();
        testJTree.setVisible(true);
    }
    
}