写了小程度测试java死锁,代码如下。
我的疑问是:被锁定对象为什么要用static修饰呢?不用static就锁不住,不能出现死锁了。
public class TestDeadLock implements Runnable{
public int flag = 0;
static Object o1 = new Object(); static Object o2 = new Object();
public void run(){
System.out.println("flag=" + flag);
if(flag==1){
synchronized(o1){
try{
Thread.sleep(1500);
}catch(InterruptedException e){
e.printStackTrace();
}
synchronized(o2){
System.out.println("1");
}
}
}
if(flag==0){
synchronized(o2){
try{
Thread.sleep(1500);
}catch(InterruptedException e){
e.printStackTrace();
}
synchronized(o1){
System.out.println("0");
}
}
}
}
public static void main(String[] args){
TestDeadLock td1 = new TestDeadLock();
TestDeadLock td2 = new TestDeadLock();
td1.flag = 1;
td2.flag = 0;
Thread t1 = new Thread(td1);
Thread t2 = new Thread(td2);
t1.start();
t2.start();
}
}