共计 639 个字符,预计需要花费 2 分钟才能阅读完成。
示例
public class AtomicDemo { | |
static int num1 = 0; | |
static AtomicInteger num2 = new AtomicInteger(0); | |
static class Thread1 extends Thread { | |
@Override | |
public void run() { | |
try {sleep(100); | |
} catch (InterruptedException e) {e.printStackTrace(); | |
} | |
num1++; | |
} | |
} | |
static class Thread2 extends Thread { | |
@Override | |
public void run() { | |
try {sleep(100); | |
} catch (InterruptedException e) {e.printStackTrace(); | |
} | |
num2.incrementAndGet();} | |
} | |
public static void main(String[] args) throws InterruptedException {for (int i = 0; i < 1000; i++) {new Thread1().start(); | |
new Thread2().start(); | |
} | |
Thread.sleep(2000); | |
System.out.println("num1=" + num1); | |
System.out.println("num2=" + num2.get()); | |
} | |
} |
运行结果如下:
在多线程无锁的情况下,num1 总是小于等于 1000,而 num2 因为原子性的方法总是等于 1000。
正文完
发表至: java
2019-07-14