关于JAVA的简单问题(NO1)

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最新学JAVA GUI 学着做!!!

可是有点问题高手帮我一下吧谢谢!!!

源代码如下:

import java.awt.*;
import java.awt.event.*;

class GG1 {

public static void main(String[] args)

{
new frame1("小游戏");

}

class frame1 extends Frame implements WindowListener {

private static final long serialVersionUID = 4829859849379317456L;

double k;

double a = (double) Math.random() * 100;

TextField t1; TextField t2; TextField t3;

Button b1;

frame1(String s) {
setSize(50, 100);

        t1 = new TextField("请输入数字:");
       t2 = new TextField("次数");
        t3 = new TextField("判断");

        b1 = new Button("Enter");
        setLocation(100, 100);
        addWindowListener(this);

add(t1, BorderLayout.NORTH);

        add(t2, BorderLayout.CENTER);
        add(t3, BorderLayout.SOUTH);
        add(b1, BorderLayout.EAST);
        setVisible(true);

         t1.addActionListener((ActionListener) this);
         t2.addActionListener((ActionListener) this);
         t3.addActionListener((ActionListener) this);
         b1.addActionListener((ActionListener) this);

}

        public void actionPerformed(ActionEvent e) {
        if (e.getSource() == b1) {
                  try {
                         k = Double.parseDouble(t1.getText());
                        }

                  catch (Exception ee) {
                            ee.getStackTrace();
                       }

                     if (k > a)
                     t3.setText("大了");
                     if (k < a)
                     t3.setText("小了");
                     if (k > a)
                     t3.setText("正确");
                    }
        }

public void windowActivated(WindowEvent arg0) {

}

public void windowClosed(WindowEvent arg0) {

}

public void windowClosing(WindowEvent arg0) {
System.exit(0);

}

public void windowDeactivated(WindowEvent arg0) {

}

public void windowDeiconified(WindowEvent arg0) {

}

public void windowIconified(WindowEvent arg0) {

}

public void windowOpened(WindowEvent arg0) {

}
}

为什么总是不能响应呢?

高手指点一下吧!!!