一、竞态条件
先来看一段代码。
/** * UnsafeSequence * */ public class UnsafeSequence { private int value; // Returns a unique value. public int getNext() { return value++;// value++导致竞态条件 } // 下面测试程序是自己写的 public static void main(String[] args) { UnsafeSequence obj = new UnsafeSequence(); Thread thread1 = new Thread(new Runnable() { @Override public void run() { for (int i = 0; i < 1000; ++i) { System.out.println("Thead1:" + obj.getNext()); try { Thread.sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } } } }); thread1.start(); Thread thread2 = new Thread(new Runnable() { @Override public void run() { for (int i = 0; i <1000; ++i) { System.out.println("Thead2:" + obj.getNext()); try { Thread.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); } } } });
