高级UI组件之树

  简略的说就是节点（DefaultMutableTreeNodes）加内容，内容再加内容，（前内容）便子节点。

package test;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.GridLayout;
import javax.swing.JTextArea;

public class NewTest {

	private DefaultMutableTreeNode root = new DefaultMutableTreeNode("学校管理");
	private DefaultMutableTreeNode t = new DefaultMutableTreeNode("教师");
	private DefaultMutableTreeNode s = new DefaultMutableTreeNode("学生");
	
	private DefaultMutableTreeNode t1 = new DefaultMutableTreeNode("孔子");
	private DefaultMutableTreeNode t2 = new DefaultMutableTreeNode("孟子");
	private DefaultMutableTreeNode s1 = new DefaultMutableTreeNode("子路");
	private DefaultMutableTreeNode s2 = new DefaultMutableTreeNode("子游");
	private DefaultMutableTreeNode s3 = new DefaultMutableTreeNode("子渊");
	private JFrame frame;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					NewTest window = new NewTest();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public NewTest() {
		initialize();
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 543, 405);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		JPanel panel = new JPanel();
		frame.getContentPane().add(panel, BorderLayout.CENTER);
		panel.setLayout(null);
		
		JPanel panel_1 = new JPanel();
		panel_1.setBounds(0, 0, 180, 358);
		panel.add(panel_1);
		panel_1.setLayout(null);
		JPanel panel_2 = new JPanel();
		panel_2.setBounds(179, 0, 346, 358);
		panel.add(panel_2);
		panel_2.setLayout(new GridLayout(1, 0, 0, 0));
		
		JTextArea textArea = new JTextArea();
		panel_2.add(textArea);
		JTree tree = new JTree(root);
		root.add(s);
		root.add(t);
		s.add(s1);
		s.add(s2);
		s.add(s3);
		t.add(t1);
		t.add(t2);
		tree.setBounds(0, 0, 180, 358);
		panel_1.add(tree);
		tree.addTreeSelectionListener(new TreeSelectionListener() {
			
			@Override
			public void valueChanged(TreeSelectionEvent e) {
				// TODO Auto-generated method stub
			 	DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
			    if(node.isLeaf()) {
			    	textArea.setText(node.getUserObject().toString());
			    }
			}
		});
		
		
		
		
	}
}

效果显示：