example5_10.java

书中的例题

/* 最简单的JTree示例 */
import java.awt.*;
import javax.swing.*;
class TreeDemo extends JFrame
{
  public TreeDemo()
  {
    setSize(400,300);
    setTitle("演示怎样使用JTree");
	show();
    JScrollPane jPanel = new JScrollPane();
    getContentPane().add(jPanel);
    //创建系统默认的树型对象
	JTree jtree = new JTree();
    //在面板上添加树型结构
	jPanel.getViewport().add(jtree, null);
	validate();
    //点击"关闭窗口"按钮时，则退出
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}
   //主类
  public class Example5_10
  {
    public static void main(String[] args)
     {
          TreeDemo frame = new TreeDemo();
     }
  }