A-M baby

Task/Mutex/Java/mutex-3.java

@@ -0,0 +1,35 @@
+public class Main {
+    static Object mutex = new Object();
+    static int i = 0;
+
+    public void addAndPrint()
+    {
+        System.out.print("" + i + " + 1 = ");
+        i++;
+        System.out.println("" + i);
+    }
+
+    public void subAndPrint()
+    {
+        System.out.print("" + i + " - 1 = ");
+        i--;
+        System.out.println("" + i);
+    }
+
+
+    public static void main(String[] args){
+        final Main m = new Main();
+        new Thread() {
+            public void run()
+            {
+                while (true) { synchronized(m.mutex) { m.addAndPrint(); } }
+            }
+        }.start();
+        new Thread() {
+            public void run()
+            {
+                while (true) { synchronized(m.mutex) { m.subAndPrint(); } }
+            }
+        }.start();
+    }
+}