一、锁定类
package com.zsx.demo.lock;
import lombok.extern.log4j.Log4j2;
import java.time.LocalDateTime;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
@Log4j2
public class LockClass {
private static final Lock lock = new ReentrantLock();
public void print() {
lock.lock();
try {
log.info("Current thread {} enters the print method, enter current time : {}", Thread.currentThread().getName(), LocalDateTime.now());
TimeUnit.SECONDS.sleep(2);
log.info("Current thread {} exits the print method, exit current time : {}", Thread.currentThread().getName(), LocalDateTime.now());
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
new Thread(()->{
LockClass lockClass = new LockClass();
lockClass.print();
lockClass.print();
}, String.format("t%d", i)).start();
}
}
}
1.运行结果
14:06:19.471 [t0] INFO com.zsx.demo.lock.LockClass - Current thread t0 enters the print method, enter current time : 2019-12-05T14:06:19.466575
14:06:21.476 [t0] INFO com.zsx.demo.lock.LockClass - Current thread t0 exits the print method, exit current time : 2019-12-05T14:06:21.476431400
14:06:21.477 [t0] INFO com.zsx.demo.lock.LockClass - Current thread t0 enters the print method, enter current time : 2019-12-05T14:06:21.476431400
14:06:23.478 [t0] INFO com.zsx.demo.lock.LockClass - Current thread t0 exits the print method, exit current time : 2019-12-05T14:06:23.478086200
14:06:23.478 [t2] INFO com.zsx.demo.lock.LockClass - Current thread t2 enters the print method, enter current time : 2019-12-05T14:06:23.478889
14:06:25.480 [t2] INFO com.zsx.demo.lock.LockClass - Current thread t2 exits the print method, exit current time : 2019-12-05T14:06:25.480727300
14:06:25.481 [t2] INFO com.zsx.demo.lock.LockClass - Current thread t2 enters the print method, enter current time : 2019-12-05T14:06:25.481491600
14:06:27.482 [t2] INFO com.zsx.demo.lock.LockClass - Current thread t2 exits the print method, exit current time : 2019-12-05T14:06:27.482367100
14:06:27.483 [t1] INFO com.zsx.demo.lock.LockClass - Current thread t1 enters the print method, enter current time : 2019-12-05T14:06:27.482367100
14:06:29.484 [t1] INFO com.zsx.demo.lock.LockClass - Current thread t1 exits the print method, exit current time : 2019-12-05T14:06:29.484020800
14:06:29.484 [t1] INFO com.zsx.demo.lock.LockClass - Current thread t1 enters the print method, enter current time : 2019-12-05T14:06:29.484020800
14:06:31.485 [t1] INFO com.zsx.demo.lock.LockClass - Current thread t1 exits the print method, exit current time : 2019-12-05T14:06:31.485670600
14:06:31.486 [t3] INFO com.zsx.demo.lock.LockClass - Current thread t3 enters the print method, enter current time : 2019-12-05T14:06:31.486439
14:06:33.487 [t3] INFO com.zsx.demo.lock.LockClass - Current thread t3 exits the print method, exit current time : 2019-12-05T14:06:33.487110600
14:06:33.487 [t3] INFO com.zsx.demo.lock.LockClass - Current thread t3 enters the print method, enter current time : 2019-12-05T14:06:33.487110600
14:06:35.487 [t3] INFO com.zsx.demo.lock.LockClass - Current thread t3 exits the print method, exit current time : 2019-12-05T14:06:35.487958200
14:06:35.488 [t4] INFO com.zsx.demo.lock.LockClass - Current thread t4 enters the print method, enter current time : 2019-12-05T14:06:35.488767200
14:06:37.489 [t4] INFO com.zsx.demo.lock.LockClass - Current thread t4 exits the print method, exit current time : 2019-12-05T14:06:37.489627300
14:06:37.489 [t4] INFO com.zsx.demo.lock.LockClass - Current thread t4 enters the print method, enter current time : 2019-12-05T14:06:37.489627300
14:06:39.491 [t4] INFO com.zsx.demo.lock.LockClass - Current thread t4 exits the print method, exit current time : 2019-12-05T14:06:39.491256800二、锁定对象
package com.zsx.demo.lock;
import lombok.extern.log4j.Log4j2;
import java.time.LocalDateTime;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
@Log4j2
public class LockObject {
private final Lock lock = new ReentrantLock();
public void print() {
lock.lock();
try {
log.info("Current thread {} enters the print method, enter current time : {}", Thread.currentThread().getName(), LocalDateTime.now());
TimeUnit.SECONDS.sleep(2);
log.info("Current thread {} exits the print method, exit current time : {}", Thread.currentThread().getName(), LocalDateTime.now());
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
new Thread(()->{
LockObject lockObject = new LockObject();
lockObject.print();
lockObject.print();
}, String.format("t%d", i)).start();
}
}
}
2.运行结果
14:12:00.627 [t2] INFO com.zsx.demo.lock.LockObject - Current thread t2 enters the print method, enter current time : 2019-12-05T14:12:00.621256700
14:12:00.627 [t3] INFO com.zsx.demo.lock.LockObject - Current thread t3 enters the print method, enter current time : 2019-12-05T14:12:00.621256700
14:12:00.627 [t1] INFO com.zsx.demo.lock.LockObject - Current thread t1 enters the print method, enter current time : 2019-12-05T14:12:00.621256700
14:12:00.627 [t0] INFO com.zsx.demo.lock.LockObject - Current thread t0 enters the print method, enter current time : 2019-12-05T14:12:00.621256700
14:12:00.626 [t4] INFO com.zsx.demo.lock.LockObject - Current thread t4 enters the print method, enter current time : 2019-12-05T14:12:00.621256700
14:12:02.633 [t1] INFO com.zsx.demo.lock.LockObject - Current thread t1 exits the print method, exit current time : 2019-12-05T14:12:02.633123500
14:12:02.633 [t3] INFO com.zsx.demo.lock.LockObject - Current thread t3 exits the print method, exit current time : 2019-12-05T14:12:02.633123500
14:12:02.633 [t0] INFO com.zsx.demo.lock.LockObject - Current thread t0 exits the print method, exit current time : 2019-12-05T14:12:02.633123500
14:12:02.633 [t2] INFO com.zsx.demo.lock.LockObject - Current thread t2 exits the print method, exit current time : 2019-12-05T14:12:02.633123500
14:12:02.633 [t1] INFO com.zsx.demo.lock.LockObject - Current thread t1 enters the print method, enter current time : 2019-12-05T14:12:02.633897200
14:12:02.633 [t3] INFO com.zsx.demo.lock.LockObject - Current thread t3 enters the print method, enter current time : 2019-12-05T14:12:02.633897200
14:12:02.633 [t0] INFO com.zsx.demo.lock.LockObject - Current thread t0 enters the print method, enter current time : 2019-12-05T14:12:02.633897200
14:12:02.633 [t2] INFO com.zsx.demo.lock.LockObject - Current thread t2 enters the print method, enter current time : 2019-12-05T14:12:02.633897200
14:12:02.633 [t4] INFO com.zsx.demo.lock.LockObject - Current thread t4 exits the print method, exit current time : 2019-12-05T14:12:02.633123500
14:12:02.634 [t4] INFO com.zsx.demo.lock.LockObject - Current thread t4 enters the print method, enter current time : 2019-12-05T14:12:02.634905600
14:12:04.634 [t0] INFO com.zsx.demo.lock.LockObject - Current thread t0 exits the print method, exit current time : 2019-12-05T14:12:04.634749600
14:12:04.634 [t1] INFO com.zsx.demo.lock.LockObject - Current thread t1 exits the print method, exit current time : 2019-12-05T14:12:04.634749600
14:12:04.634 [t3] INFO com.zsx.demo.lock.LockObject - Current thread t3 exits the print method, exit current time : 2019-12-05T14:12:04.634749600
14:12:04.634 [t2] INFO com.zsx.demo.lock.LockObject - Current thread t2 exits the print method, exit current time : 2019-12-05T14:12:04.634749600
14:12:04.635 [t4] INFO com.zsx.demo.lock.LockObject - Current thread t4 exits the print method, exit current time : 2019-12-05T14:12:04.635527600