用JAVA写的简单GUI

importjava.awt.*;importjavax.swing.*;importjava.awt.event.*;importjavax.swing.event.*;classmyFrameextendsJFrameimplementsActionListener{JButtonbutton;JTextFieldtextField1;JTextFieldtextField2;JTextFieldtextField3;JLabellabel1,label2,label3,label4;myFrame(){super("GUIexercise"