启动一个线程是调用start()方法，使线程就绪状态，以后可以被调度为运行状态，一个线程必须关联一些具体的执行代码，run()方法是该线程所关联的执行代码。[code]package net.hawebs.oss;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
- HAWEBS.NET 测试代码
- HA WEBSYSTEMS (罕布什尔信息技术有限公司)
- [email protected]
- @author YUCHENGHU
*/
public class Hawebs {
private int j;
private final Lock lock = new ReentrantLock();
public static void main(String[] args) {
// TODO Auto-generated method stub
Hawebs tt = new Hawebs();
for (int i = 0; i < 2; i++) {
new Thread(tt.new Adder()).start();
new Thread(tt.new Subtractor()).start();
}
}
private class Subtractor implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
/*
* synchronized (ThreadTest.this) { System.out.println("j--=" +
* j--); //这里抛异常了，锁能释放吗？ }
*/
lock.lock();
try {
System.out.println("j--=" + j--);
} finally {
lock.unlock();
}
}
}
}
private class Adder implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
/*
* synchronized (ThreadTest.this) { System.out.println("j++=" +
* j++); }
*/
lock.lock();
try {
System.out.println("j++=" + j++);
} finally {
lock.unlock();
}
}
}
}
}
[/code]