Java语言程序设计10E LiangPPT习题案例30slide.ppt

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1、1Chapter30MultithreadingandParallelProgramming2ObjectivesTogetanoverviewofmultithreading(§30.2).TodeveloptaskclassesbyimplementingtheRunnableinterface(§30.3).TocreatethreadstoruntasksusingtheThreadclass(§30.3).TocontrolthreadsusingthemethodsintheThreadclass(§30.

2、4).TocontrolanimationsusingthreadsandusePlatform.runLatertorunthecodeinapplicationthread(§30.5).Toexecutetasksinathreadpool(§30.6).Tousesynchronizedmethodsorblockstosynchronizethreadstoavoidraceconditions(§30.7).Tosynchronizethreadsusinglocks(§30.8).Tofacilitate

3、threadcommunicationsusingconditionsonlocks(§§30.9–30.10).Touseblockingqueuestosynchronizeaccesstoanarrayqueue,linkedqueue,andpriorityqueue(§30.11).Torestrictthenumberofaccessestoasharedresourceusingsemaphores(§30.12).Tousetheresource-orderingtechniquetoavoiddead

4、locks(§30.13).Todescribethelifecycleofathread(§30.14).TocreatesynchronizedcollectionsusingthestaticmethodsintheCollectionsclass(§30.15).TodevelopparallelprogramsusingtheFork/JoinFramework(§30.16).3ThreadsConceptMultiplethreadsonmultipleCPUsMultiplethreadssharing

5、asingleCPU4CreatingTasksandThreads5Example:UsingtheRunnableInterfacetoCreateandLaunchThreadsObjective:Createandrunthreethreads:Thefirstthreadprintsthelettera100times.Thesecondthreadprintstheletterb100times.Thethirdthreadprintstheintegers1through100.TaskThreadDe

6、moRun6TheThreadClass7TheStaticyield()MethodYoucanusetheyield()methodtotemporarilyreleasetimeforotherthreads.Forexample,supposeyoumodifythecodeinLines53-57inTaskThreadDemo.javaasfollows:publicvoidrun(){for(inti=1;i<=lastNum;i++){System.out.print(""+i);Thread.yiel

7、d();}}Everytimeanumberisprinted,theprint100threadisyielded.So,thenumbersareprintedafterthecharacters.8TheStaticsleep(milliseconds)MethodThesleep(longmills)methodputsthethreadtosleepforthespecifiedtimeinmilliseconds.Forexample,supposeyoumodifythecodeinLines53-57i

8、nTaskThreadDemo.javaasfollows:publicvoidrun(){for(inti=1;i<=lastNum;i++){System.out.print(""+i);try{if(i>=50)Thread.sleep(1);}catch(InterruptedExceptionex){}}}Everyti