Java Synchronized 略解

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 stub
if(flag){
while(true){
synchronized (object) {   //synchronized 锁object对象
if(tick > 0){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.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 block
e.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 block
e.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 stub
if(flag){
while(true){
synchronized (this) {
if(tick > 0){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.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 block
e.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 block
e.printStackTrace();
}
t.flag =  false;
t2.start();
}
}

打印结果 ：Thread-0...show...1 到此为止