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锁定老帖子 主题：写死锁的郁闷
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发表时间：2008-04-02
这段时间在看马士兵老师的关于线程同步的教程，完了自己想写一个死锁出来，按照马老师的精髓，我写了下面的代码，但我无论如何也没法将它锁死，下面是代码希望大家帮忙看下是什么原因，我感谢万分！！！！(jdK版本：6.0)
package cn.zhangxuemin.j2se;
public class TestDeadLock implements Runnable{
static int flag ;
static Object o1 = new Object();
static Object o2 = new Object();
public void run () {
System.out.println("flag= "+flag);
if(flag==2) {
synchronized (o1) {
System.out.println("i am object 1");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o2) {
System.out.println("i am object 2");
}
}
}
if(flag==1) {
synchronized (o2) {
System.out.println("i am object 222");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o1) {
System.out.println("i am object 111");
}
}
}
}
public static void main(String[] args) {
TestDeadLock test1 = new TestDeadLock();
TestDeadLock test2 = new TestDeadLock();
Thread t1 = new Thread(test1);
Thread t2 = new Thread(test2);
flag = 1;
t1.start();
flag = 2;
t2.start();
}
}
运行结果： flag= 2 i am object 1 flag= 2 i am object 2 i am object 1 i am object 2 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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发表时间：2009-03-12
这样改就行： public class TestDeadLock implements Runnable{
int flag ;
static Object o1 = new Object();
static Object o2 = new Object();
TestDeadLock(int i)
{
this.flag=i;
}
public void run () {
System.out.println("flag= "+flag);
if(flag==2) {
synchronized (o1) {
System.out.println("i am object 1");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o2) {
System.out.println("i am object 2");
}
}
}
if(flag==1) {
synchronized (o2) {
System.out.println("i am object 222");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o1) {
System.out.println("i am object 111");
}
}
}
}
public static void main(String[] args) {
TestDeadLock test1 = new TestDeadLock(1);
TestDeadLock test2 = new TestDeadLock(2);
Thread t1 = new Thread(test1);
Thread t2 = new Thread(test2);
t1.start();
t2.start();
}
}
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