synchronized和Lock都可以控制线程的同步，同一时间只能有一个线程操作上锁资源。
Lock是一个接口，而synchronized是Java中的关键字。
1.Lock是显式锁，可以手动开启和关闭，切结必须手动关闭，不然容易造成线程死锁。synchronized是隐式锁，出了作用域自动释放。
2.Lock只有代码块锁，而synchronized既有代码块锁，也有方法锁。
3.Lock锁性能更好，JVM花费少量的时间来调度线程。
未上锁资源
1 public class TestLock {
2 public static void main(String[] args) {
3 Person2 person2 = new Person2();
4 new Thread(person2,"可恶的黄牛").start();
5 new Thread(person2,"苦逼的她们").start();
6 new Thread(person2,"苦逼的我").start();
7 }
8 }
9 class Person2 implements Runnable{
10 //定义lock锁
11 private ReentrantLock lock = new ReentrantLock();
12 int ticketNums = 10;
13 private boolean flag = true;
14 @Override
15 public void run() {
16 while (flag){
17 try {
18 Thread.sleep(100);
19 if(ticketNums > 0){
20 System.out.println(Thread.currentThread().getName()+"买到第"+ticketNums--+"张票");
21 } else {
22 flag = false;
23 }
24 } catch (InterruptedException e) {
25 e.printStackTrace();
26 }finally {
27 }
28 }
29 }
30 }View Code
使用synchronized关键字
1 public class TestSysc {
2 public static void main(String[] args) {
3 Person person = new Person();
4 new Thread(person,"可恶的黄牛").start();
5 new Thread(person,"苦逼的她们").start();
6 new Thread(person,"苦逼的我").start();
7 }
8 }
9 class Person implements Runnable{
10 int ticketNums = 10;
11 private boolean flag = true;
12 @Override
13 public synchronized void run() {
14 while (flag){
15 if(ticketNums > 0){
16 try {
17 Thread.sleep(1000);
18 } catch (InterruptedException e) {
19 e.printStackTrace();
20 }
21 System.out.println(Thread.currentThread().getName()+"买到第"+ticketNums--+"张票");
22 }else {
23 flag = false;
24 }
25 }
26 }
27 }
使用Lock
1 public class TestLock {
2 public static void main(String[] args) {
3 Person2 person2 = new Person2();
4 new Thread(person2,"可恶的黄牛").start();
5 new Thread(person2,"苦逼的她们").start();
6 new Thread(person2,"苦逼的我").start();
7 }
8 }
9 class Person2 implements Runnable{
10 //定义lock锁
11 private ReentrantLock lock = new ReentrantLock();
12 int ticketNums = 10;
13 private boolean flag = true;
14 @Override
15 public void run() {
16 while (flag){
17 try {
18 lock.lock();
19 Thread.sleep(100);
20 if(ticketNums > 0){
21 System.out.println(Thread.currentThread().getName()+"买到第"+ticketNums--+"张票");
22 } else {
23 flag = false;
24 }
25 } catch (InterruptedException e) {
26 e.printStackTrace();
27 }finally {
28 lock.unlock();
29 }
30 }
31 }
32 }
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