Java Synchronized 略解

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同步条件 ①两个或两个以上线程对象用同意堆栈 ② synchronize 锁同一对象

synchrozed （默认）锁的对象是 this

代码验证：同步条件

class Ticket implements Runnable{boolean flag = true;private int tick = 1000;Object object = new Object();public void run() {// TODO Auto-generated method stubif(flag){while(true){synchronized (object) {   //synchronized 锁object对象if(tick > 0){try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println(Thread.currentThread().getName() + "...show..." + tick--);}}}}else{while(true){show();}}}public synchronized void  show() {if(tick > 0){try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println(Thread.currentThread().getName() + "...sale..." + tick--);}}}public class Hello {public static void main(String[] args) {Ticket t = new Ticket();Thread t1 = new Thread(t);Thread t2 = new Thread(t);t1.start();try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}t.flag =  false;t2.start();}}

打印结果会出现：Thread-0...show...0

class Ticket implements Runnable{boolean flag = true;private int tick = 1000;Object object = new Object();public void run() {// TODO Auto-generated method stubif(flag){while(true){synchronized (this) {if(tick > 0){try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println(Thread.currentThread().getName() + "...show..." + tick--);}}}}else{while(true){show();}}}public synchronized void  show() {if(tick > 0){try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println(Thread.currentThread().getName() + "...sale..." + tick--);}}}public class Hello {public static void main(String[] args) {Ticket t = new Ticket();Thread t1 = new Thread(t);Thread t2 = new Thread(t);t1.start();try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}t.flag =  false;t2.start();}}

打印结果：Thread-0...show...1 到此为止

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