/**
* 两个线程交替执行，a线程打印123，b线程打印456 和打印次数，执行结果是123456 0 123456 1 123456 2 ......
* @author shangjie
*
*/
public class TwoThreadLock {
private static Object LOCK = new Object();
private static boolean flag = false;
public static void main(String[] args) {
Thread b = new Thread() {
public void run() {
for (int c = 0; c <= 100; c++) {
synchronized (LOCK) {
for (int i = 4; i <= 6; i++) {
System.out.print(i);
}
System.out.print(" " + c);
System.out.println();
if(flag){
flag = false;
LOCK.notify();
if (c < 100) {
try {
LOCK.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}
};
Thread a = new Thread() {
public void run() {
for (int c = 0; c <= 100; c++) {
synchronized (LOCK) {
for (int i = 1; i <= 3; i++) {
System.out.print(i);
}
if(!flag){
flag = true;
LOCK.notify();//在这里虽然唤醒了另一个线程b，但锁并没有释放
if (c < 100) {
try {
LOCK.wait();//在wait后的瞬间线程b得到锁
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}
};
a.start();
b.start();
}
}
package com.mfz.test;
public class TwoThread {
private static Object lock = new Object();
private static boolean flag = false;
public static void main(String[] args) {
Thread a = new Thread(){
public void run()
{
while(true)
{
synchronized(lock)
{
System.out.println("Thread1");
if(flag)
{
flag = false;
lock.notify();
try {
lock.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
};
Thread b = new Thread(){
public void run()
{
while(true)
{
synchronized(lock)
{
System.out.println("Thread2");
if(!flag)
{
flag =true;
try {
lock.notify();
lock.wait();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
}
}
};
a.start();
b.start();
}
}