使用Lock对象实现同步效果
Lock是一个接口,为了使用一个Lock对象,需要用到
Lock lock = new ReentrantLock();
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package multiplethread;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class TestThread {
public static String now() {
return new SimpleDateFormat( "HH:mm:ss" ).format( new Date());
}
public static void log(String msg) {
System.out.printf( "%s %s %s %n" , now() , Thread.currentThread().getName() , msg);
}
public static void main(String[] args) {
Lock lock = new ReentrantLock();
Thread t1 = new Thread() {
public void run() {
try {
log( "线程启动" );
log( "试图占有对象:lock" );
lock.lock();
log( "占有对象:lock" );
log( "进行5秒的业务操作" );
Thread.sleep( 5000 );
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
log( "释放对象:lock" );
lock.unlock();
}
log( "线程结束" );
}
};
t1.setName( "t1" );
t1.start();
try {
//先让t1飞2秒
Thread.sleep( 2000 );
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Thread t2 = new Thread() {
public void run() {
try {
log( "线程启动" );
log( "试图占有对象:lock" );
lock.lock();
log( "占有对象:lock" );
log( "进行5秒的业务操作" );
Thread.sleep( 5000 );
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
log( "释放对象:lock" );
lock.unlock();
}
log( "线程结束" );
}
};
t2.setName( "t2" );
t2.start();
}
} |