问答题

本题程序的功能是程序的主窗口有一个“登录”按钮和两个文本框——“请输入密码：”和“密码验证…”，用户在密码框中输入密码后单击“登录”按钮，然后与预先定义的密码比较(密码预设定为password)，如果相同，则在“密码验证…，’文本框中提示“通过！”否则提示“失败!”。“密码验证…”文本框是只读的。请将下述程序补充完整(注意：不得改动程序的结构，不得增行或删行)。 import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class simple { public static void main(String[] args) { LoginFrame frame = new LoginFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame,show (); } } class LoginFrame extends JFrame public LoginFrame() { setTitle("simple"); setSize(WIDTH,HEIGHT); Container contentPane = getContentPane(); JPanel textPanel = new JPanel(); JLabel inputPassword = new JLabel("请输入密码:",JLabel.CENTER); MyPassword = new JPasswordField(20); textPanel.add(inputPassword); textPanel.add(myPassword); JLabel checkedPassword = new JLabel("密码验证...",JLabel.LEFT); CheckPassword = new JTextField(20); ______; textPanel.add(checkedPassword); textPanel.add(checkPassword); loginButton = new JButton("登录"); loginButton.addActionListener(new LoginAction()); textPane1.add(ioginButton); contentPane.add(textPanel); } private class LoginAction implements ActionListener { public void actionPerformed(ActionEvent event) { char[] s = myPassword.getPassword(); String gets = new String(s); if(gets.equals(CHECKPASSWORD)) { checkPassword,setText ("通过!"); } else { checkPassword.setText ("失败"); } } } public static final int WIDTH = 280; public static final int HEIGHT = 180; public static final String CHECKPASSWORD = "password"; ______; private JTextField checkPassword; private JButton loginButton;