class Test implements Runnable {
private boolean flag;
Test(boolean flag) {
this.flag = flag;
}
public void run() {
if (flag) {
synchronized (Lock.locka) {
System.out.println("if locka");
synchronized (Lock.lockb) {
System.out.println("if lockb");
}
}
} else {
synchronized (Lock.lockb) {
System.out.println("else lockb");
synchronized (Lock.locka) {
System.out.println("else locka");
}
}
}
}
}
class Lock
{
static Object locka = new Object();
static Object lockb = new Object();
}
public class Demo {
public static void main(String[] args) {
Thread t1 = new Thread(new Test(true));
Thread t2 = new Thread(new Test(false));
t1.start();
t2.start();
}
}
这种情况会出现死锁!
当时为什么我把
class Lock
{
static Object locka = new Object();
static Object lockb = new Object();
}
Object类放到Test类里面创建就没有出现死锁现象。测试n多遍。
求大神告知