高手指点：这样的错误怎么去除？？？谢谢！
package card;

import javax.swing.*;
import java.awt.*;
import javax.swing.tree.*;


class Jtree1 extends JTree{


}
public class eventFrame extends JFrame {
  JSplitPane jSplitPane1 = new JSplitPane();
  JTree jTree1 = new JTree();

  public eventFrame() {
  try {
  jbInit();
  }
  catch(Exception e) {
  e.printStackTrace();
  }
  }
  private void jbInit() throws Exception {
  this.setEnabled(true);
  this.getContentPane().setLayout(null);
  jSplitPane1.setBounds(new Rectangle(22, 13, 350, 278));
  jSplitPane1.setDividerLocation(100);
  this.getContentPane().add(jSplitPane1, null);
  jSplitPane1.add(jTree1, JSplitPane.LEFT);
  DefaultMutableTreeNode root = new DefaultMutableTreeNode("信用卡系统");
  DefaultMutableTreeNode bitchThing = new DefaultMutableTreeNode("查询");
  bitchThing = new DefaultMutableTreeNode("存款");
  root.add(bitchThing);
  bitchThing = new DefaultMutableTreeNode("取款");
  root.add(bitchThing);
  root.add(bitchThing);
  jTree1 = new JTree(root);

  jSplitPane1.add(jTree1,JSplitPane.LEFT);
  jTree1.addTreeSelectionListener(this);
  int mode = TreeSelectionModel.SINGLE_TREE_SELECTION;
  jTree1.getSelectionModel().setSelectionMode(mode);

  }
}

报的错是：
"eventFrame.java": addTreeSelectionListener(javax.swing.event.TreeSelectionListener) in javax.swing.JTree cannot be applied to () at line 48, column 12
怎么解决？谢谢！！！

------解决方案--------------------
jTree1.addTreeSelectionListener(this); 是在添加侦听器，里面的参数是TreeSelectionListener()；
可以试试下面的：
jTree1.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode)
jTree1.getLastSelectedPathComponent();

//if nothing is selected
if (node == null) 
return;
}
});



------解决方案--------------------
尝试一下： jTree1.addTreeSelectionListener((TreeSelectionListener)this);//强制类型转换，