synchronized关键字理解

Author: coder-msc

Intervice/src/main/java/com/scma/synchronized_test/synchronizedTest.java

@@ -0,0 +1,27 @@
+package com.scma.synchronized_test;
+
+/*
+ * 关键字synchronized 原理
+ * */
+public class synchronizedTest implements Runnable {
+    public static int num = 0;
+
+    @Override
+    public void run() {
+        for (int i = 0; i < 1000; i++) {
+            num++;
+        }
+    }
+
+    public static void main(String[] args) {
+        for(int i=0;i<100;i++){
+            new Thread(new synchronizedTest()).start();
+        }
+        try {
+            Thread.sleep(2000);  //等所有线程执行++ 操作完成
+        } catch ( Exception e) {
+
+        }
+        System.out.println(num);
+    }
+}