计算机真题回忆

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1、考题回忆Sreejith310-0251.publicstaticvoidmain(Stringargs[]){Booleana[]=newBoolean[4];intI=1;System.out.println(a[I]);}Whatwillbeprinted?CompilationErrorinLine2CompilationErrorinline4ExceptioninLine4WillprinttrueWillprintfalseWillprintnullAns:F2.publicstaticvo

2、idmain(Stringargs[]){Integerb=newInteger(10);Add(b);System.out.println(b.intvalue());}voidAdd(Integerb){intI=b.intvalue();I+=3;b=newInteger(I)}Whatwillbeprintedout?Willprint13Willprint10CompilationErrorinLine4?.implicitconversiontoIntegertoStringisnotposs

3、ibleCompilationErrorinline10youcan'treinitializeaWrapperclassExceptioninLine10Ans:bclasstext{publicstaticvoidmain(Stringargs[]){Stringa=args[1];Stringb=args[2];Stringc=args[3];}}ifyouwillexecutejavatextcatdogsheepwhatwillbethevalueofthe'c'?catdogsheepComp

4、ilationErrorExceptionwilloccurAns:E4.publicstaticvoidmain(Stringargs[]){Floatf=newFloat(4.2f);Floatc;Doubled=newDouble(4.2);floatfl=4.2f;c=f;}whichwillreturntrue?.Selectallf.equls(d)c==fc==dc.equls(f)Ans:B,D5.publicstaticvoidmain(Stringargs[]){Strings;Sys

5、tem.out.println("s="+s);}whatwillbeprintedout?CompilationErrorAnExceptionwilloccurWillprints=nullWillprints=Ans:A6.classsextendsThread{intj=0;publicvoidrun(){try{Thread.sleep(5000);}catch(Exceptione){}j=100;}publicstaticvoidmain(Stringargs[]){st1=news();t

6、1.start();System.out.println(t1.j);}}whatyouhavetodotoensurethat'j'willprint100youhavemaket1asDaemonThreadYouhavejointhet1tomainYouhavetosuspendthemainwhenthethreadstartsandresumeitafterthevalueof'j'issetto100YouhavetointerruptthemainthreadAns:B7.Whatwill

7、happenifyoucompile/runthiscode?1:publicclassQ1implementsRunnable2:{3:publicvoidrun(Strings)4:{5:System.out.println("BeforestartThread:"+s);6:7:System.out.println("AfterstopofThread:"+s);8:}9:10:publicstaticvoidmain(String[]args)11:{12:Q1a=newQ1();13:Threa

8、dt=newThread(a);14:t.start();}15:}A)Compilationerroratline1B)Runtimeexceptionatline13.C)Compilationerroratline14D)Prints"BeforestartofThread"AfterStartofThreadAns:A8.classsimplementsRunnable{intx=0,y=0;intaddX(){x++