package comm;
class Res {
String name;
String sex;
}
class Input implements Runnable {
private Res r;
public Input(Res r) {
this.r = r;
}
public void run() {
int x = 0;
while (true) {
synchronized (r) { //注意,两个线程加的锁应该是一样的,否则依然不同步,
if (x == 0) {
r.name = "mike";
r.sex = "man";
} else {
r.name = "丽丽";
r.sex = "女女女";
}
x = (x + 1) % 2;
}
}
}
}
class Output implements Runnable {
private Res r;
public Output(Res r) {
this.r = r;
}
public void run() {
while (true)
synchronized (r) {
System.out.println(r.name + " , " + r.sex);
}
}
}
public class InputOutoutDemo {
public static void main(String[] args) {
Res r = new Res();
Input in = new Input(r);
Output out = new Output(r);
Thread t1 = new Thread(in);
Thread t2 = new Thread(out);
t1.start();
t2.start();
}
}
加的同步锁是Res r,确保两个线程的锁是同一个。
可能的输出结果是
mike , man
mike , man
mike , man
mike , man
mike , man
mike , man
mike , man
mike , man
mike , man
mike , man
丽丽 , 女女女
丽丽 , 女女女
丽丽 , 女女女
丽丽 , 女女女
虽然输出没有出现不同步现象,但是并不是期望中的mike , man
,丽丽 , 女女女
交替出现。