diff --git a/src/main/java/thead/thread_6/ObjectService.java b/src/main/java/thead/thread_6/ObjectService.java
new file mode 100644
index 0000000..9b26618
--- /dev/null
+++ b/src/main/java/thead/thread_6/ObjectService.java
@@ -0,0 +1,14 @@
+package thead.thread_6;
+
+import java.time.LocalDateTime;
+import java.util.concurrent.TimeUnit;
+
+public class ObjectService {
+    public void serviceMethod() throws InterruptedException {
+        synchronized (this) {
+            System.out.println("开始时间：" + LocalDateTime.now());
+            TimeUnit.SECONDS.sleep(2);
+            System.out.println("结束时间：" + LocalDateTime.now());
+        }
+    }
+}
diff --git a/src/main/java/thead/thread_6/Run.java b/src/main/java/thead/thread_6/Run.java
new file mode 100644
index 0000000..6a6fea0
--- /dev/null
+++ b/src/main/java/thead/thread_6/Run.java
@@ -0,0 +1,15 @@
+package thead.thread_6;
+
+public class Run {
+    public static void main(String[] args) {
+        // 因为使用的时同一个 ObjectService 所以代码是同步执行的
+        ObjectService objectService = new ObjectService();
+        ThreadA threadA = new ThreadA(objectService);
+        threadA.setName("ThreadA");
+        threadA.start();
+
+        ThreadB threadB = new ThreadB(objectService);
+        threadB.setName("ThreadB");
+        threadB.start();
+    }
+}
diff --git a/src/main/java/thead/thread_6/ThreadA.java b/src/main/java/thead/thread_6/ThreadA.java
new file mode 100644
index 0000000..155154c
--- /dev/null
+++ b/src/main/java/thead/thread_6/ThreadA.java
@@ -0,0 +1,22 @@
+package thead.thread_6;
+
+import lombok.SneakyThrows;
+
+public class ThreadA extends Thread {
+    private final ObjectService objectService;
+
+    public ThreadA(ObjectService objectService) {
+        super();
+        this.objectService = objectService;
+    }
+
+    @SneakyThrows
+    @Override
+    public void run() {
+        super.run();
+        objectService.serviceMethod();
+    }
+}
+
+
+
diff --git a/src/main/java/thead/thread_6/ThreadB.java b/src/main/java/thead/thread_6/ThreadB.java
new file mode 100644
index 0000000..0f4db53
--- /dev/null
+++ b/src/main/java/thead/thread_6/ThreadB.java
@@ -0,0 +1,19 @@
+package thead.thread_6;
+
+import lombok.SneakyThrows;
+
+public class ThreadB extends Thread {
+    private final ObjectService objectService;
+
+    public ThreadB(ObjectService objectService) {
+        super();
+        this.objectService = objectService;
+    }
+
+    @SneakyThrows
+    @Override
+    public void run() {
+        super.run();
+        objectService.serviceMethod();
+    }
+}
\ No newline at end of file