update:demo11

com/study/demo11/CountdownTimer.java

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+package com.study.demo11;
+
+import java.awt.Button;
+import java.awt.FlowLayout;
+import java.awt.Frame;
+import java.awt.Label;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class CountdownTimer extends Frame {
+    private Button sendButton;
+    private Label statusLabel;
+    private int remainingSeconds = 10;
+    private Timer timer;
+
+    public CountdownTimer() {
+        super("按钮控制器");
+
+        sendButton = new Button("发送验证码");
+        statusLabel = new Label("", Label.CENTER);
+
+        sendButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                startCountdown();
+            }
+        });
+
+        setLayout(new FlowLayout());
+        add(sendButton);
+        add(statusLabel);
+
+        setSize(300, 150);
+        setLocationRelativeTo(null);
+        setVisible(true);
+    }
+
+    private void startCountdown() {
+        sendButton.setEnabled(false);
+        remainingSeconds = 10;
+
+        timer = new Timer();
+        timer.scheduleAtFixedRate(new TimerTask() {
+            @Override
+            public void run() {
+                remainingSeconds--;
+                if (remainingSeconds > 0) {
+                    statusLabel.setText("剩余时间：" + remainingSeconds + "秒");
+                } else {
+                    timer.cancel();
+                    sendButton.setEnabled(true);
+                    statusLabel.setText("可以重新发送");
+                }
+            }
+        }, 1000, 1000);
+    }
+
+    public static void main(String[] args) {
+        new CountdownTimer();
+    }
+}

com/study/demo11/EventStatistics.java

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+package com.study.demo11;
+
+import java.awt.Button;
+import java.awt.FlowLayout;
+import java.awt.Frame;
+import java.awt.Label;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class EventStatistics extends Frame {
+    private Button clickButton;
+    private Label countLabel;
+    private Label periodLabel;
+    private int clickCount = 0;
+    private DateTimeFormatter formatter;
+
+    public EventStatistics() {
+        super("事件统计器");
+        formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+        clickButton = new Button("点击");
+        countLabel = new Label("点击次数：0", Label.CENTER);
+        periodLabel = new Label("统计周期：5秒", Label.CENTER);
+
+        clickButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                incrementClickCount();
+            }
+        });
+
+        setLayout(new FlowLayout());
+        add(clickButton);
+        add(countLabel);
+        add(periodLabel);
+
+        setSize(300, 150);
+        setLocationRelativeTo(null);
+        setVisible(true);
+
+        startStatisticsTimer();
+    }
+
+    private void incrementClickCount() {
+        clickCount++;
+        countLabel.setText("点击次数：" + clickCount);
+    }
+
+    private void startStatisticsTimer() {
+        new Timer().scheduleAtFixedRate(new TimerTask() {
+            @Override
+            public void run() {
+                LocalDateTime now = LocalDateTime.now();
+                String statistics = "过去 5 秒内点击次数：" + clickCount;
+                System.out.println(statistics);
+                System.out.println("统计时间点：" + now.format(formatter));
+                clickCount = 0;
+                countLabel.setText("点击次数：0");
+            }
+        }, 5000, 5000);
+    }
+
+    public static void main(String[] args) {
+        new EventStatistics();
+    }
+}

com/study/demo11/TimeLogger.java

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+package com.study.demo11;
+
+import java.awt.Button;
+import java.awt.Frame;
+import java.awt.TextArea;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class TimeLogger extends Frame {
+    private Button logButton;
+    private TextArea logArea;
+    private DateTimeFormatter formatter;
+
+    public TimeLogger() {
+        super("时间记录器");
+        formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+        logButton = new Button("记录时间");
+        logArea = new TextArea(10, 40);
+        logArea.setEditable(false);
+
+        logButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                logTime();
+            }
+        });
+
+        add(logButton, java.awt.BorderLayout.NORTH);
+        add(logArea, java.awt.BorderLayout.CENTER);
+
+        setSize(400, 300);
+        setLocationRelativeTo(null);
+        setVisible(true);
+    }
+
+    private void logTime() {
+        LocalDateTime now = LocalDateTime.now();
+        String timeStr = "点击时间：" + now.format(formatter) + "\n";
+        logArea.append(timeStr);
+    }
+
+    public static void main(String[] args) {
+        new TimeLogger();
+    }
+}

com/study/demo11/TimeViewer.java

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+package com.study.demo11;
+
+import java.awt.Frame;
+import java.awt.Label;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class TimeViewer extends Frame {
+    private Label timeLabel;
+    private DateTimeFormatter formatter;
+
+    public TimeViewer() {
+        super("系统时间显示器");
+        formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+        timeLabel = new Label("", Label.CENTER);
+        add(timeLabel);
+
+        setSize(300, 100);
+        setLayout(new java.awt.FlowLayout());
+        setLocationRelativeTo(null);
+        setVisible(true);
+
+        updateTime();
+        startTimeUpdate();
+    }
+
+    private void updateTime() {
+        LocalDateTime now = LocalDateTime.now();
+        timeLabel.setText(now.format(formatter));
+    }
+
+    private void startTimeUpdate() {
+        new java.util.Timer().scheduleAtFixedRate(new java.util.TimerTask() {
+            @Override
+            public void run() {
+                updateTime();
+            }
+        }, 0, 1000);
+    }
+
+    public static void main(String[] args) {
+        new TimeViewer();
+    }
+}