ReentrantLock
ReentrantLock可以等同于synchronized使用。
ReentrantLock 类实现了Lock ，它拥有与synchronized 相同的并发性和内存语义，但是添加了类似锁投票、定时锁等候和可中断锁等候的一些特性。此外，它还提供了在激烈争用情况下更佳的性能。（换句话说，当许多线程都想访问共享资源时，JVM 可以花更少的时候来调度线程，把更多时间用在执行线程上。
Condition
线程之间的通信。Condition 将 Object 监视器方法（wait、notify 和 notifyAll）分解成截然不同的对象，以便通过将这些对象与任意 Lock 实现组合使用。
请看demo：
/**
* 子线程 和 主线程 协助工作
*
* main 打印一次
* sub 打印2次
*
* @ClassName: ThreadMutex
* @Description: TODO(这里用一句话描述这个类的作用)
* @author ZhangWei
* @date 2015年8月17日 下午5:24:54
*
*/
public class ThreadMutexByThreeThread {
public static void main(String[] args) {
final Buiness2 b = new Buiness2();
new Thread(){
@Override
public void run() {
for (int i = 1; i <= 50; i++) {
b.sub1();
}
}
}.start();
new Thread(){
@Override
public void run() {
for (int i = 1; i <= 50; i++) {
b.sub2();
}
}
}.start();
for (int i = 1; i <= 50; i++) {
b.main();
}
}
}
class Buiness2{
/**
*
* 1 main 走
* 2 sub1 走
* 3 sub2 走
*
*/
private int shouldWho = 0;
private Lock lock = new ReentrantLock();
private Condition con1 = lock.newCondition();
private Condition con2 = lock.newCondition();
private Condition con3 = lock.newCondition();
public void sub1(){
lock.lock();
try {
while(shouldWho !=1 ){
try {
// this.wait();
con2.await();
} catch (Exception e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 2; j++) {
System.out.println("sub1 Thread sequnced:"+j);
}
shouldWho = 2;
con3.signal();
} catch (Exception e) {
e.printStackTrace();
} finally{
lock.unlock();
}
}
public void sub2(){
lock.lock();
try {
while( shouldWho != 2 ){
try {
// this.wait();
con3.await();
} catch (Exception e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 2; j++) {
System.out.println("sub2 Thread sequnced:"+j);
}
shouldWho = 0;
con1.signal();
} catch (Exception e) {
e.printStackTrace();
} finally{
lock.unlock();
}
}
public void main(){
lock.lock();
try {
while( shouldWho != 0 ){
try {
con1.await();
} catch (Exception e) {
e.printStackTrace();
}
}
for (int j = 1; j <= 1; j++) {
System.out.println("main Thread sequnced:"+j);
}
shouldWho = 1;
//this.notify();
con2.signal();
} catch (Exception e) {
e.printStackTrace();
} finally{
lock.unlock();
}
}
}
console:
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2
main Thread sequnced:1
sub1 Thread sequnced:1
sub1 Thread sequnced:2
sub2 Thread sequnced:1
sub2 Thread sequnced:2