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标题: JTree没有响应事件？请看看是不是代码的问题 [打印本页]

作者: 王庚 时间: 2004-08-08 07:51
标题: JTree没有响应事件？请看看是不是代码的问题
public class Frame1 extends JFrame implements TreeSelectionListener
{
  .....
  JTree tree;
  //Construct the frame
  public Frame1()
  {
......
try
{
   jbInit();

   }
....
}
  //Component initialization
  private void jbInit() throws Exception
  {
......
DefaultMutableTreeNode root = new DefaultMutableTreeNode("同学通讯录"

;
DefaultMutableTreeNode t1 = new DefaultMutableTreeNode("大学同学"

;
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("研究生同学"

;
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("李晓"

;
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode ("王光明"

;
DefaultMutableTreeNode t2_1=new DefaultMutableTreeNode ("洞明光"

;
DefaultMutableTreeNode t2_2=new DefaultMutableTreeNode ("代学才"

;
......
root.add(t1);
root.add(t2);
t1.add(t1_1);
t1.add(t1_2);
t2.add(t2_1);
t2.add(t2_2);
JTree tree = new JTree(root);
tree.addTreeSelectionListener(this);
jPanel1.add(tree);
......
}
public void valueChanged (TreeSelectionEvent e)
{
System.out.print("洞明光"

; ***************************************
if(((JTree)e.getSource())==tree)
{
System.out.print("到tree了！"

;  ###################################
   String str=tree.getLastSelectedPathComponent().toString();
   if(str.equals("洞明光"

)
   {
      jTextArea1.setText("洞明光");
      System.out.print("洞明光");
   }
   else if(str.equals("代学才"))
   {
      jTextArea1.setText("代学才");
      System.out.print("代学才");
   }
   else if(str.equals("王光明"))
   {
      jTextArea1.setText("王光明");
      System.out.print("王光明");
   }
   else if(str.equals("李晓"))
   {
      jTextArea1.setText("李晓");
      System.out.print("李晓");
   }
   else
   {
      //jTextArea1.setText(str.getUserObject().toString());
   }
   this.show();
}
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e)
  {
......
}
}
我在程序中加了两个输出行，如上面的***行和###行位置，运行时，***行正常运行，但是
###行没运行。我想不出问题在哪？请帮忙~~

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