import java.awt.*;
import java.awt.Event.*;
public class QQTest extends Frame implements ActionListener {
    public Label L1;
    public Label L2;
    public Label L3;
    public Label L4;
    public Label L5;
    public TextField T1;
    public TextField T2;
    public  Button B1;
    public Button B2;
    public Checkbox C1;
    public Checkbox C2;
    public Frame f1;
    public Panel p1;
    public Panel p2;
     public Panel p3;
     public Panel p4;
     
    public QQTest() {
         L1=new Label("账号");
         L2=new Label("注册新账号");
         L3=new Label("密码");
         L4=new Label("取回密码");
         L5=new Label("状态");
         B1=new Button("设置");
         B2=new Button("登录");
         C1=new  Checkbox("记住密码");
         C2=new  Checkbox("自动登录");
         f1=new Frame("QQ2009");
          T1=new TextField();
        T2=new TextField();
    }
    public void  QQLanch()
    {
      f1.setLayout(new GridLayout(4,1));
      p1=new Panel();
      p2=new Panel();
      p3=new Panel();
      p4=new Panel();
   
      p1.add(L1);
      p1.add(T1);
      p1.add(L2);
      p2.add(L3);
      p2.add(T2);
      p2.add(L4);
      p3.add(L5);
      p3.add(C1);
      p3.add(C2);
      p4.add(B1);
      p4.add(B2);
      f1.add(p1);
      f1.add(p2);
      f1.add(p3);
      f1.add(p4);
      f1.pack();
      f1.setVisible(true);
    }
    public static void main(String[] args)
    {
      QQTest QQ1=new QQTest();
     QQ1.QQLanch();
    }
}



Compiling 1 source file to E:\java application\QQTest\build\classes
E:\java application\QQTest\src\QQTest.java:3: 找不到符号
符号： 类 ActionListener
public class QQTest extends Frame implements ActionListener {
1 错误

环境变量设置是对的。。

谢啦，解决了。。