50道javase练习题题库

50道javase练习题（50道javase练习题）

[program1]

Title:classicalquestion:thereareapairofrabbits,born

fromthirdmonthsafterbirtheachmonthapairofrabbits,

smallrabbitsgrowuptothirdmonthslater,everymonthand

apairofrabbits,iftherabbitdoesnotdie,

Whatisthetotalnumberofrabbitspermonth?

1.programanalysis:thenumberofrabbits.

1,1,2,3,5,8,13,21...

[program2]

Topic:determinethenumberofprimesbetween101-200,andthe

outputofallprimenumbers.

1.programanalysis:themethodofjudgingprimenumbers:

remove2tosqrt(anumber)withanumber,ifdivisible,

Itindicatesthatthisnumberisnotprime,andisaprime

number.

[program3]

Title:printoutallthe"Narcissusnumbers”,socalled

“narcissusnumber“referstoathreedigitnumber,thenumber

ofcubicandequaltothenumberitself.Forexample,"153"is

a"narcissusnumber””,

Becausethreetimesthreetimesthreetimes5+3153=1.

1.programanalysis:usetheforcycletocontrol100-999

numbers,eachnumberdecomposesabit,tenbits,hundreds.

[program4]

Title:apositiveintegerdecompositionofthequalityfactor.

Forexample:enter90,printout90=2*3*3*5.

Programanalysis:todecomposetheprimefactorofN,weshould

firstfindaminimumprimenumberk,andthencompletethe

followingsteps:

(1)iftheprimenumberisequaltoN,theprocessofdecomposing

theprimefactorisfinishedandprintedout.

(2)ifn<>k,butnisdivisiblebyK,thevalueofKshould

beprinted,anddividedbyNK,apositiveintegerasanewn

yourepeatthefirststep.

(3)ifnisnotdivisiblebyK,withk+1asthevalueofK,repeat

thefirststep.

[program5]

Title:usethenestingofconditionaloperatorstocomplete

thisquestion:studentswithacademicscores>=90pointsare

representedbyA,60-89pointsarerepresentedbyB,and60

pointsarerepresentedbyC.

1.programanalysis:(a>b)a:b?Thisisabasicexampleofthe

conditionaloperator.

[program6]

EntertwopositiveintegersmandN,findthegreatestcommon

divisorandleastcommonmultiple.

1.programanalysis:usingrollingmethod.

[program7]

Title:enteralineofcharacters,respectively,thenumberof

Englishletters,spaces,numbersandothercharacters.

1.programanalysis:usingthewhilestatement,fortheinput

characterisnot'\n.

[program8]

Topic:s=a+aa+aaa+aaaa+aa...A,whereaisanumber.For

example,2+22+222+2222+22222(thetotalsumof5numbers),a

fewnumberswithkeyboardcontrol.

1.programanalysis:thekeyistocalculateeachitemvalue.

[program9]

Topic:ifanumberisexactlyequaltothesumofitsfactors,

thisnumberiscalled"endofafew”.Forexample6=123.

programmingtofindallcompletedwithin1000.

[program10]

Topic:aballfromafreefallheightof100meters,eachlanding

halfantijumpbacktotheoriginalheight;thenfall,forit

inthetenthfloor,howmanymeters?Howhighistherebound

forthetenthtime?

[program11]

Title:1,2,3,4numbers,howmanydifferentnumberscanbe

formedwithouteachotherandthreedigits?Howmucharethey?

1.programanalysis:canfillat100,ten,anumberis1,2,

3,4.Thenremovethearrangementdoesnotmeetthecondition

whichallarranged.

[program12]

Title:corporatebonusesbasedonprofits.Profit(I)lessthan

orequalto10millionyuan,thebonuscanbe10%;profithigher

than10million,lessthan20million,lessthan10millionpart

ofthe10%Commission,higherthan10million,cocoapercentage

between20millionto7.5%;40million,20millionhigherthan

theparttheCommission,5%;40millionhigherthanthepart

between40millionto60million,totheCommissionof3%;

between60millionto100million,higherthan60million,to

theCommissionof1.5%,higherthan100million,

Morethan1millionyuanpartoftheCommissionby1%,fromthe

keyboardinputmonthprofitI,thetotalamountofbonusshould

beawarded?

1.programanalysis:pleaseuseafewaxestoboundaries,

positioning.Notethatthedefinitionneedstodefineinteger

growthbonus.

[program13]

Title:aninteger,plus100,isaperfectsquarenumber,plus

168isacompletesquarenumber,whatisthenumber?

1.programanalysis:judgmentinlessthan100thousand,the

numberofthefirstand100aftertheroot,thenthenumberof

plus268afterprescribing,ifafterprescribingresultsmeet

thefollowingconditions,whichistheresultof.Pleasesee

theconcreteanalysis:

[program14]

Enteracertainperiodofaday,judgmentdayisthefirstfew

daysthisyear?

1.programanalysis:inMarch5th,forexample,shouldfirst

addupthefirsttwomonths,andthenadd5days,thatis,the

firstfewdaysoftheyear,specialcircumstances,leapyear

andinputmonthisgreaterthan3,needtoconsidermorethan

oneday.

[program15]

Enterthreeintegersx,y,Z,pleaseputthethreenumberof

smalltolargeoutput.

1.programanalysis:wetrytogetthesmallestnumberonX,

thefirstXcomparedwiththeY,ifx>ywillXandYvalues

ofexchange,andthenxandZarecompared,ifx>ZwillXand

Zvaluesofexchange,sothattheminimumX.

[program16]

Topic:theoutputof9*9formulas.

1.programanalysis:branchesandareconsideredatotalof9

rows9,Icontrolline,Jcontrol.

[program17]

Themonkeyeatsthepeachproblem:themonkeytakesoffseveral

peachesonthefirstday,eatshalfimmediately,isnotaddicted,

eatsonemoresecond,inthemorning,willeatthepeach

remaininghalf,haseatenonemore.Aftereverymorningtoeat

therestofthedaybeforeaYibanlingyi.Thetenthdayinthe

morningtoeat,seeonlyapeach.Howmuchdidyoupickupfor

thefirstday?.

1.programanalysis:adoptthemethodofreversethinking,

forwardinferencefrom.

[program18]

Title:twotabletennisteamcompetition,eachpersonthree.

Ateamofa,B,Cthree,BteamsfortheX,y,Zthree.Thelist

ofmatcheshasbeendrawn.Someoneaskstheplayersforalist

ofthematches.Asaidheisnotmorethanx,Csaidhedidnot

x,Z,programmedtoidentifyalistofthreeteamsracing.

1.programanalysis:judgetheprimenumbermethod:useanumber

toremove2tosqrt(thisnumber),ifcanbedivisible,itshows

thatthisnumberisnotprime,andviceversaisprimenumber.

[program19]

Title:printthefollowingpattern(diamond)

*

***

Tiananmen

Result

Tiananmen

***

*

1.programanalysis:first,thegraphicsaredividedintotwo

partstosee,thefirstfourlinesofarule,thelatterthree

linesofarule,theuseofdoubleforcycle,thefirstlayer

controlline,thesecondlayercontrolcolumn.

[program20]

Thereisasequenceoffractions:2/1,3/2,5/3,8/5,13/8,

21/13...Andthesumofthefirst20oftheseries.

1.programanalysis:pleaseseizethechangerulebetweenthe

numerator.

[program21]

Title:1+2!+3!+...+20!

1.programanalysis:thisprocedureistobringthecumulative

becomeamultiplicative.

[program22]

Topic:usingrecursivemethodtofind5!.

1.programanalysis:recursiveformula:fn=fn1*4!

[program23]

Topic:thereare5peoplesittogether,askthefifthperson

howold?Hesaidhewas2yearsolderthanfourth.Askfourth

peopleage,hesaidthatmorethanthirdpeoplein2years.Ask

thirdpeople,morethansecondpeopleandtwo.Asksecondpeople,

twoyearsolderthanthefirstpersonsaid.Finallyaskedthe

firstman,hesaid,10yearsold.Howbigarefifthpeople?

1.programanalysis:usingtherecursivemethod,recursiveand

recursivebacksteppingisdividedintotwostages.Ifyouwant

toknowtheageoffifthpeople,youneedtoknowtheageof

thefourthperson,andinturn,pushtothefirstperson(10

yearsold),andthenpushback.

[program24]

Title:giveanomorethan5positiveintegers,requirements:

first,askitisafewdigits,two,reverseprintoutyour

figures.

[program25]

Title:a5digit,itisnotapalindromejudgment.That12321

isapalindrome,abitandbitthesametenmillion,with

thousandsofthesame.

[program26]

Title:enterthefirstletteroftheweektodeterminewhatday

itis.Ifthefirstletteristhesame,thencontinuetojudge

thesecondletter.

1.programanalysis:usingthesituationstatementisbetter,

ifthefirstletteristhesame,thenjudgetousethesituation

statementorifsentencetodeterminethesecondletters.

[program27]

Title:seekingprimeswithin100

[program28]

Title:sorting10numbers

1.programanalysis:canusetheselectionmethod,from9months

afterthecomparisonprocess,selectaminimumexchangewith

thefirstelement,thenextanalogy,withsecondelementsand

8Comparisonandexchange.

[program29]

Topic:finda3*3matrixanddiagonalelements

1.programanalysis:usedoubleforcyclecontrolinput

two-dimensionalarray,andthenaccumulatea[i][i]output.

[program30]

Topic:asortedarray.Nowenteranumber,accordingtothe

requirementsoftheoriginallawitisinsertedintothearray.

1.programanalysis:firstdeterminewhetherthenumberis

greaterthanthelastnumber,andthenconsidertheinsertion

ofthenumberofthemiddle,afterinsertingtheelementafter

thenumber,followedbyaposition.

[program31]

Title:outputanarrayinreverseorder.

1.programanalysis:thefirstandthelastexchange.

[program32]

Topic:takeanintegerafromtherightendofthebeginning

ofthe4~7.

Programanalysis:thiscanbeconsidered:

(1)moveato4bitfirst.

(2)tosetupalowof4for1,therestofthenumber0.Available

~(~0<<4)

(3)carryontheabovetwooperations.

[program33]

Title:printYangHuitriangle(printout10linesasshown

below)

1.programanalysis:

One

11

121

1331

14641

15101051

[program34]

Topic:enterthenumber3A,B,C,accordingtothesequence

ofoutput.

1.programanalysis:usingpointermethod.

[program35]

Theinputarray,thelargestexchangewiththefirstelement,

thesmallestwiththelastelementexchange,outputarray.

[program36]

Title:therearenintegers,sothatthenumberofthefront

ofthemovebacktomposition,andfinallymnumberintothe

frontofthenumberofM

[program37]

Topic:npersonalcircle,orderarranging.Startedfromthe

firstreport(from1to3report),whoreported3peopleout

ofthecircle,leavingthelastquestionistheoriginalnumber.

[program38]

Title:writeafunction,findthelengthofastring,enterthe

stringinthemainfunction,andoutputitslength.

[program39]

Title:writeafunction,inputnevennumber,callthefunction

for1/2+1/4+...+l/n,whentheinputnisodd,callthefunction

1/1+1/3+...+l/n(usingpointerfunction)

[program40]

Stringsorting.

[program41]

Thebeachthereisapileofpeaches,fivemonkeysto.Thefirst

monkeydividedthepeachesintofiveparts,onemore.Themonkey

threwoneofthemanyintotheseaandtookone.

Thesecondmonkeysdividedtheremainingpeachesintofive

equally,andanotherone,whichthrewonemoreintothesea,

tookone,andthird,fourth,andfifthmonkeysdidthesame,

Asktheoriginalonthebeachatleasthowmanypeaches?

[program42]

Topic:809*??=800*??+9*??+1??thetwodigit,

8*??theresultistwodigits,9*??theresultis3digits.Ask

for??thedoubledigits,andtheresultof809*??.

[program43]

Topic:fortheoddnumberof0to7can.

[program44]

Topic:anevennumbercanalwaysbeexpressedasthesumoftwo

primes.

[program45]

Topic:whetheraprimenumbercanbedivisibleby9

[program46]

Title:twostringconnectionprogram

[program47]

Title:readtheintegernumberof7numbers(1-50),reada

valueeverytime,andprintoutthenumberofthevalue.

[program48]

Topic:usingapublictelephonetransmissionofdata,thedata

isfourintegers,inthetransmissionprocessisencrypted,

encryptionrulesareasfollows:Eachfigureswith5,andthen

dividedby10toreplacetheremainderofthedigital,thefirst

andfourthexchange,secondandthirdexchange.

[program49]

Topic:Calculationofstringneutron

[program50]

Topic:therearefivestudents,eachstudenthas3classesof

results,morethanfromthekeyboardinputdata(including

studentnumber,name,threecourseresults),calculatethe

averagescore,thestatusoftheoriginaldataandcalculated

theaveragescoreisstoredinthediskfile"stud".

SomeofthemareClanguagequestions,buttheyshouldbedone

withJAVA

1.codingtoachievetheinheritanceofelectricalrelations:

[useJavadocannotationclass,allmethods,]1electrical

appliancesclass(Wiring)hasattributes:power(power),rated

voltage(pressure),

Ratedcurrent(current)andDCtype(electricity).Method:

defaultconstructionmethod(initializationvoltagevalueis

220V,ACandDCtypeis"AC"),

Theelectricalmethod(work),thepreparationofgetandset

method1TVforeachattribute(TV)attribute:TVtype(type),

themaximumvolume(volume)methodhas:constructionmethod

(currentworkingvoltage100V,50TV,TVtypeinitialization

rainbow50inchLCD,maximumvolume,200)TVworkmethod(work)

[TVoutputal1theattributesintheworkofthevalue,write

getandsetLfortheTVrefrigeratorCategoryattribute(Icebox)

attribute:Volume(capacity)methodwithvoltagemethod

[achieveinitializationrefrigerator110V,current53,

capacityofworkingmethods230.5]refrigerator(work)

[attribute],refrigeratorgetpreparedwithsetmethodthe

valueofoutputallattributesintheworkoftherefrigerator;

Throughinheritancetoachievetheaboverequirements,and

preparethetestclassWiringTesttest.

2.encodingisrealizedusingEmployeeandProgra