?

class?Thread1?extends?Thread?

{?

????private?MasterCard?mc;//將mc類對(duì)象傳入作為成員變量?

?????

????public?Thread1(MasterCard?mc)?

????{?

????????this.mc?=?mc;?

????}?

?????

????public?void?run()?

????{?

????????mc.charge1000();//調(diào)用synchronized方法，相當(dāng)于鎖住的是引用該方法的類對(duì)象mc本身?

??????//??mc.charge();//單線程時(shí)run方法內(nèi)部相當(dāng)于調(diào)用對(duì)象mc的方法?

????}?

}?

?

class?Thread2?extends?Thread?

{?

????private?MasterCard?mc;?

?????

????public?Thread2(MasterCard?mc)?

????{?

????????this.mc?=?mc;?

????}?

?????

????public?void?run()?

????{?

????????mc.printMoney();?

????????mc.charge2000();?

????}?

}?

public?class?MasterCard?

{?

????int?money?=?10000;?

????public?synchronized?void?charge2000()//修飾方法，相當(dāng)于鎖住的是引用該方法的類對(duì)象本身?

????{?

//????????synchronized(this)?

//????????{?

????????????this.money?-=?2000;?

????????????System.out.println("取2000后余額："?+?this.money);?

//????????}?

????}?

?????

????public?void?printMoney()?

????{?

????????System.out.println("取2000前余額："?+?this.money);?

????}?

?????

????public?synchronized?void?charge1000()?

????{?

//????????synchronized(this)?

//????????{?

????????????this.money?-=?1000;?

????????????System.out.println("取1000后余額："?+?this.money);?

//????????}?

????}?

?????

????public?static?void?main(String[]?args)?

????{?

????????MasterCard?mc?=?new?MasterCard();?

????????Thread1?t1?=?new?Thread1(mc);?

????????t1.start();?

????????Thread2?t2?=?new?Thread2(mc);?

????????t2.start();?

?????????

????}?

?????

????public?void?charge()?

????{?

????????synchronized?(this)?

????????{?

????????????System.out.println("取款1000前："?+?money);?

????????????money?-=?1000;?

????????????System.out.println("余額："?+?money);?

????????}?

????}?

?????

?????

?????

????//?public?void?charge()?

????//?{?

????//?System.out.println("取款前："?+?money);?

????//?money?-=?1000;?

????//?System.out.println("余額："?+?money);?

????//?}?

????//?

?????

}?

轉(zhuǎn)載于:https://blog.51cto.com/glblong/1194998

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