参考文章
http://geek.csdn.net/news/detail/242345
实例1
public class TestSync2 implements Runnable {
int b = 100;
synchronized void m1() throws InterruptedException {
b = 1000;
Thread.sleep(500); // 6
System.out.println("b=" + b);
}
synchronized void m2() throws InterruptedException {
Thread.sleep(250); // 5
b = 2000;
}
public static void main(String[] args) throws InterruptedException {
TestSync2 tt = new TestSync2();
Thread t = new Thread(tt); // 1
t.start(); // 2
tt.m2(); // 3
System.out.println("main thread b=" + tt.b); // 4
}
@Override
public void run() {
try {
m1();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
我运行程序输出的结果是
main thread b=1000
b=1000
要点
synchronized直接作用于实例方法:相当于对当前实例加锁,进入同步代码前要获得当前实例的锁。