Question

java 线程，怎么写个死锁的程序

public class deadLock implements Runnable {

public int flag = 1;
static Object o1 = new Object(), o2 = new Object();

public void run() {
System.out.println("flag=" + flag);
if (flag == 1) {
synchronized (o1) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
synchronized (o2) {
System.out.println("1");
}
}
if (flag == 0) {
synchronized (o2) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
synchronized (o1) {
System.out.println("0");
}

}
}

public static void main(String[] args) {
deadLock r1 = new deadLock();
deadLock r2 = new deadLock();
r1.flag = 1;
r2.flag = 0;
Thread t1 = new Thread(r1);
Thread t2 = new Thread(r2);
t1.start();
t2.start();
}

}

我想制造个死锁，可为什么我的程序尽然没有死锁，是不是因为我的机器是双核的原因，？？

Answer 1

把后面的同步放到前面的同步里
synchronized (o1) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o2) {
System.out.println("1");
}
}