import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
/**
* JTextField、JPasswordField、JButton及事件的简单应用实例
* @author 左杰
*
*/
public class Example6Frame extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JTextField username; // 用户名输入框
private JPasswordField password; // 密码输入框
private JButton logonButton; // 登录按钮
private JButton cancelButton; // 退出按钮
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