Question

我这个java程序，怎么才能实现死锁？

import java.io.*;
import java.util.*;
public class Lock
{
public static void main(String[] args)
{
runner r1 = new runner(1);
runner r2 = new runner(0);
Thread t1 = new Thread(r1);
Thread t2 = new Thread(r2);
t1.start();
t2.start();
System.out.println("first print");
}
}
class runner implements Runnable
{
private int i = 0;
runner(int n) {i = n;}
Object o1 = new Object(),o2 = new Object();
@Override
public void run() {
// TODO Auto-generated method stub
if (i == 0)
{
synchronized (o1) {
try{
Thread.sleep(500);
}catch (InterruptedException e) {}
}
synchronized (o2) {
{
System.out.println("i == 0如果不死锁就会输出这行");
}
}
}
if (i == 1)
{
synchronized (o2) {
{
try{
Thread.sleep(500);
}catch (InterruptedException e) {}
}
}
synchronized (o1) {
System.out.println("i == 1如果不死锁就会输出这行");
}
}
}

}

Answer 1

你把o1,o2都定义成runner的内部变量，main中的r1,r2都是用的自己的内部变量，两个线程没有使用共享的公共变量。想尝试死锁，可以吧o1,o2 提出来在runner初始化给他传进去

Answer 2

给o1改了值 传给runner2 互相锁上

Answer 3

不要作死，就不会死

Answer 4

好好看。。。。