package com.java.test;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class LockTest {
private volatile Integer count = 0;
private Lock lock = new ReentrantLock();
public Runnable run1 = new Runnable(){
@Override
public void run() {
// lock.lock();
synchronized(count) {
while(count < 1000) {
try {
Thread.sleep(2000);
System.out.println(Thread.currentThread().getName() + " run1: "+count++);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// lock.unlock();
}};
public Runnable run2 = new Runnable(){
@Override
public void run() {
// lock.lock();
synchronized(count) {
while(count < 1000) {
try {
Thread.sleep(2000);
System.out.println(Thread.currentThread().getName() + " run2: "+count++);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// lock.unlock();
}};
public Runnable run3 = new Runnable(){
@Override
public void run() {
// lock.lock();
synchronized(count) {
while(count < 1000) {
try {
Thread.sleep(2000);
System.out.println(Thread.currentThread().getName() + " run3: "+count++);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// lock.unlock();
}};
public Runnable run4 = new Runnable(){
@Override
public void run() {
// lock.lock();
synchronized(count) {
while(count < 1000) {
try {
Thread.sleep(2000);
System.out.println(Thread.currentThread().getName() + " run4: "+count++);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// lock.unlock();
}};
public static void main(String[] args) throws InterruptedException {
LockTest t = new LockTest();
new Thread(t.run1).start();
Thread.sleep(1000);
new Thread(t.run2).start();
Thread.sleep(1000);
new Thread(t.run3).start();
Thread.sleep(1000);
new Thread(t.run4).start();
}
}
程序运行输出如下：
Thread-0 run1: 0
Thread-0 run1: 1
Thread-2 run3: 2
Thread-0 run1: 3
Thread-2 run3: 4
Thread-0 run1: 5
Thread-2 run3: 6
Thread-0 run1: 7
Thread-2 run3: 8
Thread-0 run1: 9
Thread-2 run3: 10
Thread-0 run1: 11
Thread-2 run3: 12
使用lock锁却达到了目的，不知道为什么...
Thread-0 run1: 0
Thread-0 run1: 1
Thread-0 run1: 2
Thread-0 run1: 3
Thread-0 run1: 4
Thread-0 run1: 5
Thread-0 run1: 6
Thread-0 run1: 7
