日期:2014-05-20 浏览次数:20879 次
package com.zdyn.action;
public class TestThread {
public static int flag = 1;
public static void main(String[] args) {
Thread t1 = new Thread(new Demo1());
Thread t2 = new Thread(new Demo2());
t1.start();
t2.start();
}
}
class Demo1 implements Runnable {
public void run() {
while (true) {
if (TestThread.flag == 1) {
System.out.println(TestThread.flag = 2);
}
}
}
}
class Demo2 implements Runnable {
public void run() {
if (TestThread.flag == 2) {
System.out.println(TestThread.flag = 1);
}
}
}
class Test implements Runnable
{
private boolean flag;
public Test(boolean flag)
{
this.flag = flag;
}
public void run()
{
if(flag)
{
while(true)
{
synchronized(MyLock.locka)
{
System.out.println("if locka");
synchronized(MyLock.lockb)
{
System.out.println("if lockb");
}
}
}
}
else
{
while(true)
{
synchronized(MyLock.lockb)
{
System.out.println("else lockb");
synchronized(MyLock.locka)
{
System.out.println("else locka");
}
}
}
}
}
}
class MyLock
{
static Object locka = new Object();
static Object lockb = new Object();
}
class DeadLockTest
{
public static void main(String[] args)
{
Thread t1 = new Thread(new Test(true));
Thread t2 = new Thread(new Test(false));
t1.start();
t2.start();
}
}