diff --git a/src/test/java/cn/whaifree/test/tse.java b/src/test/java/cn/whaifree/test/tse.java
new file mode 100644
index 0000000..f9ddbc5
--- /dev/null
+++ b/src/test/java/cn/whaifree/test/tse.java
@@ -0,0 +1,74 @@
+package cn.whaifree.test;
+
+public class tse {
+
+    final static Object o = new Object();
+    volatile static int num = 0;
+    public static void main(String[] args) {
+
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (int i = 0; i < 100; i++) {
+                        synchronized (o) {
+                            while (num % 3 != 0) {
+                                o.wait();
+                            }
+                            num++;
+                            System.out.println("A");
+                            o.notifyAll();
+                        }
+
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }).start();
+
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (int i = 0; i < 100; i++) {
+                        synchronized (o) {
+                            while (num % 3 != 1) {
+                                o.wait();
+                            }
+                            num++;
+                            System.out.println("B");
+                            o.notifyAll();
+                        }
+
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }).start();
+
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (int i = 0; i < 100; i++) {
+                        synchronized (o) {
+                            while (num % 3 != 2) {
+                                o.wait();
+                            }
+                            num++;
+                            System.out.println("C");
+                            o.notifyAll();
+                        }
+
+                    }
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }).start();
+
+
+    }
+}