java 多线程

多线程对于数据安全数据同步的小demo:

有两种方式：①,同步代码块如:可以在方法中植入同步代码块

synchronized (this) {//同步代码块

System.out.println("Thread:"+Thread.currentThread().getName()+":count:"+count);

count--;

}

②,同步方法

@Override

public void run() {

System.out.println("+++++++:"+count);

while(true){

syMethod();

try {

Thread.sleep(100);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

 

private synchronized void syMethod() {//同步方法

if(count>0){

System.out.println("Thread:"+Thread.currentThread().getName()+":count:"+count);

count--;

}

}

①,代码：同步代码块

 

public class SaleTicketDemo implements Runnable{

private int count=1000;

Object obj = new Object();

 

/**

* 处理卖票逻辑

* @see java.lang.Runnable#run()

* @author wf 2015-11-30 下午4:02:40

*/

@Override

public void run() {

System.out.println("+++++++:"+count);

try {

System.out.println("Thread:"+Thread.currentThread().getName());

Thread.currentThread().sleep(1000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

sale();

 

System.out.println("===============:"+count);

}

 

private void sale() {

while(true){

synchronized (this) {//同步代码块

if(count>0){

System.out.println("Thread:"+Thread.currentThread().getName()+":count:"+count);

count--;

}else{

return;

}

 

}

}

}