面向对象练习题（object oriented exercises）

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1、面向对象练习题（Objectorientedexercises）1.[exercises]membervariablesofclass:Guessinggame:aclassAhasamembervariableV,withaninitialvalueof100.DefineaclassandguessthemembervariableVofaclassA.Ifit'sbig,thenit'sbig,small,thenit'ssmall.Equaltopromptguesssuccess.PublicclassA{Privateintv;V=100;}Imp

2、ortutil.java.Scanner;PublicclassTest{Publicstatucvoidmain(String[]args){Scannersc=newScanner(System.in);Intnumber=(int)(Math.random()*100);Aa=newA();Intv=sc.nextInt();If(v>number){System.out.println(toobig);}elseif(v==number){System.out.println(success);}elseif(v

3、println(toosmall);}}}2.[exercises]membervariablesofclass:Pleasedefineaclassoftransportvehicles(Vehicle):Attributes:speed(speed),volume(size),etc.Methods:move(move()),setspeed(setSpeed(intspeed)),acceleratespeedUp(),deceleratespeedDown(),andsoonFinally,avehicleobjectisinstantiatedint

4、hemain()ofthetestclassVehicle,andthevalueofthespeed,sizeisinitializedbythemethod,andprintedout.Inaddition,themethodofaccelerationanddecelerationisusedtochangethespeed.PublicclassVehicle{PublicStringspeed;Publicdoublesize;Publicmove(){System.out.println("mobilemethod");}Publicvoidset

5、Speed(intspeed){This.speed=speed;System.out.println(settingspeed);}PublicspeedUp(){System.out.println("acceleration");}PublicspeedDown(){System.out.println("deceleration");}}PublicclassTest{Publicstatucvoidmain(String[]args){Vehiclev=newVehicle();}}Classvariables,methodsandconstruct

6、ionmethodsforclass3.exercisesInaprogram,timeisoftenoperated,butthereisnotemporaltypeofdata.Well,wecanimplementatimeclassourselvestomeettheneedsoftheprogram.DefineaclassnamedMyTime,whichshouldhavethreeintegermembers:time(hour),sub(minute),second(second),inordertoensurethesafetyofdata

7、,thethreemembervariablesshouldbedeclaredprivate.DefinesaconstructionmethodfortheMyTimeclasstoinitializemembervariableswhencreatingobjectseasily.Redefiningthediaplaymethodisusedtoprintthetimeinformation.AddthefollowingmethodsfortheMyTimeclass:AddSecond(intsec)AddMinute(intmin)AddHour

8、(intHou)SubSecond(i