diff --git a/src/class38/Test3.java b/src/class38/Test3.java
new file mode 100644
index 0000000..ed8578c
--- /dev/null
+++ b/src/class38/Test3.java
@@ -0,0 +1,32 @@
+package class38;
+
+import javax.swing.*;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class Test3 {
+    public static void main(String[] args) {
+        //创建一个登陆窗口，窗口上只有一个登陆按钮
+        JFrame win = new JFrame("登陆窗口");
+        win.setSize(300,200);
+        win.setLocationRelativeTo( null);
+        win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        JPanel p = new JPanel();
+        win.add(p);
+
+        JButton btn = new JButton("登陆");
+        p.add(btn);
+//        btn.addActionListener(new ActionListener() {
+//            private int count = 0;
+//            @Override
+//            public void actionPerformed(ActionEvent e) {
+//                System.out.println("登陆"+count++);
+//            }
+//        });
+        //简化
+        AtomicInteger count = new AtomicInteger();//创建一个原子类
+        btn.addActionListener((e) -> System.out.println("登陆"+(count.incrementAndGet())));
+
+        win.setVisible(true);
+    }
+}
\ No newline at end of file