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Try to explain Singleton to us? Is it thread safe? If no, how to make
it thread safe?
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更多 “ Try to explain Singleton to us? Is it thread safe? If no, how to makeit thread safe? ” 相关考题
考题
GiventhatTriangleimplementsRunnable,and:Whichtwostatements,insertedindependentlyatbothlines35and41,tendtoallowboththreadstotemporarilypauseandallowtheotherthreadtoexecute?()
A.Thread.wait（）；B.Thread.join（）；C.Thread.yield（）；D.Thread.sleep（1）；E.Thread.notify（）；
考题
5.classOrder2implementsRunnable{6.publicvoidrun（）{7.for（intx=0；x〈4；x++）{8.try{Thread.sleep（100）；}catch（Exceptione）{}9.System.out.print（r）；10.}}11.publicstaticvoidmain（String[]args）{12.Threadt=newThread（newOrder2（））；13.t.start（）；14.for（intx=0；x〈4；x++）{15.//insertcodehere16.System.out.print（m）；17.}}}哪一个插入到第15行，最有可能产生输出rmrmrmrm？（）A.Thread.sleep（1）；B.Thread.sleep（100）；C.Thread.sleep（1000）；D.try{Thread.sleep（100）；}catch（Exceptione）{}
考题
publicclassTestSevenextendsThread{privatestaticintx;publicsynchronizedvoiddoThings(){intcurrent=x;current＋＋;x=current;}publicvoidrun(){doThings();}}Whichistrue?()
A.Compilationfails.B.Anexceptionisthrownatruntime.C.Synchronizingtherun（）methodwouldmaketheclassthread-safe.D.Thedatainvariable“x”areprotectedfromconcurrentaccessproblems.E.DeclaringthedoThings（）methodasstaticwouldmaketheclassthread-safe.F.WrappingthestatementswithindoThings（）inasynchronized（newObject（））{}blockwouldmaketheclassthread-safe.
考题
publicclassMyLogger{privateStringBuilderlogger=newStringBuuilder（）；publicvoidlog（Stringmessage，Stringuser）{logger.append（message）；logger.append（user）；}}TheprogrammermustguaranteethatasingleMyLoggerobjectworksproperlyforamulti-threadedsystem.Howmustthiscodebechangedtobethread-safe？（）A.synchronizethelogmethodB.replaceStringBuilderwithStringBufferC.Nochangeisnecessary，thecurrentMyLoggercodeisalreadythread-safe.D.replaceStringBuilderwithjustaStringobjectandusethestringconcatenation（+=）withinthelogmethod
考题
publicclassAextendsThread{A（）{setDaemon（true）；}publicvoidrun（）{（newB（））.start（）；try{Thread.sleep（60000）；}catch（InterruptedExceptionx）{}System.out.println（Adone”）；}classBextendsThread{publicvoidrun（）{try{Thread.sleep（60000）；}catch（InterruptedExceptionx）{}System.out.println（Bdone”）；}}publicstaticvoidmain（String[]args）{（newA（））.start（）；}}Whatistheresult？（）A.AdoneB.BdoneC.AdoneBdoneD.BdoneAdoneE.Thereisnoexceptionthattheapplicationwillprintanything.F.Theapplicationoutputs“Adone”and“Bdone”，innoguaranteedorder.
考题
下列程序通过设定线程优先级，抢占主线程的CPU，选择正确的语句填入横线处。 class T14 implements Runnable { private Boolean fStop - true; public void run() { while(fStop) { System.out.println(Thread.currentThread().getName() + "run"); try { Thread.sleep(l); } catch(Exception e) { e.printStackTrace()； } } } public void stopRun() { fStop = false; } } public class Testl4 { public static void main(String[] args) { T14 t14 = new T14(); Thread t1 = new Thread(ti4, "T14"); Thread t = Thread.currentThread()'; ______; Ti.start(); T14.stopRun(); System.out.println ( "stop "); } }A．setPriority(Thread. MIN_PRIORITY)B．t1 .setPriority(Thread. MIN_PRIORITY)C．t.setPfiofity(Thread. MIN_PRIORITY)D．t14.setPriority(Thread. MIN_PRIORITY)
考题
用Thread子类实现多线程的步骤顺序是( )
A、声明Thread类的子类，创建Thread子类的实例，让线程调用start()方法B、声明Thread类的子类，在子类中重新定义run()方法，创建Thread子类的实例C、创建Thread子类的实例，让线程调用start()方法D、声明Thread类的子类，在子类中重新定义run()方法，创建Thread子类的实例，让线程调用start()方法
考题
18、写出反义词 safe
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