自制乐观锁

ii）自制乐观锁：

例 2.2.1.2

package com;

public class Ticket_Opti_MarkToWin {

private int number=4;

private int numberVersion=0;

private synchronized int updAtom(int num,int verNum)

{

int flag;

if(numberVersion==verNum&&number>num){

return flag;

}

void buyOne()

{

/*前面的三句，都只是get，想改只有updAtom里面，

你的buyOne只有改对和不改的权利，没有改错的权利*/

int myVersion=numberVersion;

if(flag==1){

System.out.println("买一张成功");

}else{

System.out.println("已经进队等了一会，买一张失败");

}

}

void buyBatch(int num)

{

int myVersion=numberVersion;

int myNumber=number;

}

}

package com;

class MulThreMarkToWin extends Thread {

Ticket_Opti_MarkToWin ticOpti_MarkToWin;

}

class MulThreMarkToWinBatch extends Thread {

Ticket_Opti_MarkToWin ticOpti_MarkToWin;

}

public class TestConcurBuy_MarkToWin {

public static void main(String[] args) {

Ticket_Opti_MarkToWin ticOpti_MarkToWin=new Ticket_Opti_MarkToWin();

Thread t1 = new MulThreMarkToWin(ticOpti_MarkToWin);

Thread t2 = new MulThreMarkToWinBatch(ticOpti_MarkToWin);

Thread t3 = new MulThreMarkToWin(ticOpti_MarkToWin);

Thread t4 = new MulThreMarkToWin(ticOpti_MarkToWin);

t1.start();

t2.start();

t3.start();

t4.start();

}

}

更多请看：https://blog.csdn.net/qq_44638460/article/details/104137404