import java.awt.*) import javax. swing.*; public class WindowActionEvent extends JFrame{ JTextField

代码的缩进格式不够规范，需要进行调整。此外，代码中的一些注释也需要进行调整，以保证清晰易读。以下是修改后的代码： ``` package test; import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.Random; public class Test3{ public static void main (String args[]) { Win win=new Win(); win.setTitle("输入序列号"); win.setBounds(10,10,460,360); } } class Police implements KeyListener,FocusListener{ public void keyPressed(KeyEvent e) { JTextField t=(JTextField)e.getSource(); if (t.getCarePosition()>=6) t.transferFocus(); } public void keyTyped(KeyEvent e) {} public void keyReleased(KeyEvent e) {} public void focusGained(FocusEvent e) { JTextField text=(JTextField)e.getSource(); text.setText(null); } public void focusLost(FocusEvent e){} } class Win extends JFrame { JTextField text[]=new JTextField[3]; Police police; JButton b; Win() { setLayout(new FlowLayout()); police = new Police(); for(int i=0;i<3;i++) { text[i]=new JTextField(7); text[i].addKeyListener(police); //监视键盘事件 text[i].addFocusListener(police); add(text[i]); } b=new JButton("确定"); add(b); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); text[0].requestFocusInWindow(); } } ```

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.Timer; import java.util.TimerTask; public class RestReminder extends JFrame { private JLabel timeLabel; private JButton setButton; private JButton resetButton; private JTextField restTimeField; private Timer timer; private int restTime; // 休息时间，单位为分钟 public RestReminder() { // 初始化界面和组件 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setTitle("休息提醒"); setSize(300, 200); setLocationRelativeTo(null); timeLabel = new JLabel("00:00"); timeLabel.setFont(new Font("宋体", Font.BOLD, 40)); timeLabel.setHorizontalAlignment(SwingConstants.CENTER); setButton = new JButton("设置"); resetButton = new JButton("重置"); restTimeField = new JTextField(); restTimeField.setColumns(10); JPanel panel = new JPanel(new GridLayout(3, 1)); panel.add(timeLabel); JPanel buttonPanel = new JPanel(new FlowLayout()); buttonPanel.add(setButton); buttonPanel.add(resetButton); panel.add(buttonPanel); JPanel restTimePanel = new JPanel(new FlowLayout()); restTimePanel.add(new JLabel("休息时间（分钟）：")); restTimePanel.add(restTimeField); panel.add(restTimePanel); add(panel); // 添加事件监听器 setButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { restTime = Integer.parseInt(restTimeField.getText()); startTimer(); } catch (NumberFormatException ex) { JOptionPane.showMessageDialog(RestReminder.this, "请输入正确的休息时间（整数）", "错误", JOptionPane.ERROR_MESSAGE); } } }); resetButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { stopTimer(); timeLabel.setText("00:00"); } }); } // 实现设置休息时间和提醒时间的功能 private void startTimer() { if (timer != null) { stopTimer(); } int delay = 1000; // 延迟1秒钟开始执行任务 int period = 60 * 1000; // 每隔1分钟执行一次任务 timer = new Timer(); timer.scheduleAtFixedRate(new TimerTask() { int time = restTime; @Override public void run() { if (time <= 0) { JOptionPane.showMessageDialog(RestReminder.this, "休息时间到了，请休息一下！", "休息提醒", JOptionPane.INFORMATION_MESSAGE); time = restTime; } int minute = time / 60; int second = time % 60; timeLabel.setText(String.format("%02d:%02d", minute, second)); time--; } }, delay, period); } private void stopTimer() { if (timer != null) { timer.cancel(); timer = null; } } public static void main(String[] args) { RestReminder reminder = new RestReminder(); reminder.setVisible(true); } }