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对于上述代码的改进代码如下:publicclassAlternateSuspendResumeextendsObjectimplementsRunnable{???privatevolatileintfirstVal;??privatevolatileintsecondVal;??//增加标志位,用来实现线程的挂起和恢复??privatevolatilebooleansuspended;???publicbooleanareValuesEqual(){????return(firstVal==secondVal);??}???publicvoidrun(){????try{??????suspended=false;??????firstVal=0;??????secondVal=0;??????workMethod();????}catch(InterruptedExceptionx){??????System.out.println("interruptedwhileinworkMethod()");????}??}???privatevoidworkMethod()throwsInterruptedException{????intval=1;?????while(true){??????//仅当贤臣挂起时,才运行这行代码??????waitWhileSuspended();????????stepOne(val);??????stepTwo(val);??????val++;???????//仅当线程挂起时,才运行这行代码??????waitWhileSuspended();????????Thread.sleep(200);?????}??}???privatevoidstepOne(intnewVal)???????????throwsInterruptedException{?????firstVal=newVal;????Thread.sleep(300);???}???privatevoidstepTwo(intnewVal){????secondVal=newVal;??}???publicvoidsuspendRequest(){????suspended=true;??}???publicvoidresumeRequest(){????suspended=false;??}???privatevoidwaitWhileSuspended()?????????throwsInterruptedException{?????//这是一个“繁忙等待”技术的示例。智能设备的使用让,车主们出行更加方便也更加安全。艰苦工作(HardWork)不同于艰苦地工作(HardtoDoWork)针对研究结果的小结和结论:普通演奏者花费的练习时间和优秀演奏者一样多(大约50个小时/每周),但是普通演奏者没有将主要精力用在必要的练习类型上(在一些关键性的刻意练习上花费的时间几乎只有优秀演奏者的三分之一),而且进一步看,普通演奏者将其学习和练习时间近乎随意地安排在一天之中。做邮递员所攒的积蓄大部分都是花在买书及收购电器上了。

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