JAVA並發，同步鎖效能測試

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測試主要從已耗用時間差來體現，資料量越大，時間差越明顯，例子如下：

 1 package com.xt.thinks21_2; 2  3 /** 4  * 同步鎖效能測試 5  *  6  * @author Administrator 7  * 8  */ 9 public class SynchronizedTimeTest {10     public volatile int inc = 0;11 12     public void increase() {13         inc++;14     }15 16     public static void main(String[] args) {17         final SynchronizedTimeTest test = new SynchronizedTimeTest();18         for (int i = 0; i < 10; i++) {19             new Thread() {20                 public void run() {21                     for (int j = 0; j < 10000; j++)22                         test.increase();23                 };24             }.start();25         }26         Long time1 = System.currentTimeMillis();27         while (Thread.activeCount() > 1) {28             // 保證前面的線程都執行完29             Thread.yield();30         }31         Long time2 = System.currentTimeMillis();32         System.out.println("time1:" + time1 + " time2:" + time2);33         Long timeDiff = time2 - time1;34         System.out.println("time:" + timeDiff + "-->" + test.inc);35     }36 }

上面是方法未加synchronized運行結果：

time1:1429805281187 time2:1429805281187
time:0-->75809

方法添加synchronized運行結果：

time1:1429805416628 time2:1429805416645
time:17-->100000

JAVA並發，同步鎖效能測試