java练习题目（java练习题目）

java练习题目（java练习题目）

[program1]

Title:classicalquestion:thereareapairofrabbits,from

birththirdmonthsfromthebirthofapairofrabbitsevery

month,thelittlerabbitgrowstothirdmonths,amonthafter

birth

Forrabbits,ifrabbitsdon'tdie,askthetotalnumberof

rabbitspermonth?

1.programanalysis:thelawsoftherabbitseries

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

[program2]

Title:determinehowmanyprimestherearebetween101-200,and

outputallprimes.

1.programanalysis:determinetheprimenumbermethod:with

anumberof2tosqrtremoved(thisnumber),ifyoucanbe

divisible,

Itshowsthatthisnumberisnotaprimenumber,butisaprime

number.

[program3]

Title:printoutallthe“narcissusnumber”,theso-called

“narcissusnumber"referstoathreedigit,thenumberofcubic

andequaltothenumberitself.Suchas:

The153isa“daffodils”,becausethreetimesthreetimesthree

times5+3153=1.

1.programanalysis:theuseofforcyclecontrol100-999

numbers,eachdecompositionofanumberofbits,ten,100.

[program4]

Title:factoringapositiveintegerintoaprimefactor.For

example:enter90andprintout90=2*3*3*5.

Programanalysis:whenfactoringtheN,weshouldfirstfind

aminimumprimenumber,K,andthencompletethefollowing

steps:

(1)iftheprimenumberisexactlyn,theprocessoffactoring

thequalityfactorisoverandprintedout.

(2)ifnOk,butncanbedivisiblebyK,youshouldprintout

thevalueofK,andusentodividethequotientofKasthe

newpositiveinteger,youn,repeatthefirststep.

(3)ifncannotbedivisiblebyK,usek+1asthevalueofK

andrepeatthefirststep.

[program5]

Title:usethenestingofconditionaloperatorstocomplete

thisquestion:studentswithgrades>=90arerepresentedbyA,

between60-89pointsbyB,below60points

RepresentedbyC.

1.programanalysis:(a>b)a:b,whichisabasicexampleofthe

conditionaloperator.

[program6]

EntertwopositiveintegersmandN,findthegreatestcommon

divisorandleastcommonmultiple.

1.programanalysis:theuseofrolling.

[program7]

Title:enteralineofcharacters,respectively,statisticsin

whichEnglishletters,spaces,numbersandothercharactersof

thenumber.

1.programanalysis:usewhilestatement,theconditionforthe

inputcharacterisnot''n'.

[program8]

Title:s=a+aa+aaa+aaaa+aa=avalue,inwhichaisanumber.

Forexample,2+22+222+2222+22222(thereare5numbersadded

together),

Severalnumbersareaddedwithkeyboardcontrol.

1.programanalysis:thekeyistocalculatethevalueofeach

item.

[program9]

Topic:ifanumberisexactlyequaltothesumofitsfactors,

thisnumberiscalled“endofafew”.Forexample6=123.

programmingtofindallfinishedwithin1000

Thenumberof.

[program10]

Topic:abal1fromafreefallheightof100meters,eachlanding

halfantijumpbacktotheoriginalheight;thenfall,forit

inthetenthfloor,atotalofover

Lessrice?Howhighisthetenthbounce?

[program11]

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

formedwithouteachotherandthreedigits?Howmucharethey?

1.,programanalysis:canfillinonehundred,ten,anumber

ofdigitsare1,2,3,4.Makeupallpermutationsandthen

removepermutationsthatdonotmeettherequirements.

[program12]

Title:bonusespaidbyenterprisesarebasedonprofits.When

theprofit(I)isbeloworequalto100thousandyuan,thebonus

canberaisedby10%;theprofitishigherthan100thousand

yuan,lessthan200thousand

Yuan,lessthan100thousandyuaninpart,accordingto10%

Commission,higherthan100thousandyuanpart,cocoa

Commission7.5%;200thousandto400thousandbetween,higher

than200thousandyuanDepartment

Cent,candeductapercentagefrom5%;between400thousandand

600thousandwhenthepartishigherthan400thousandyuan,

candeductapercentagefrom3%;between600thousandand1

millionwhen,thepartthatishigherthan600thousandyuan

can

Deductapercentagefrom1.5%,whenhigherthan1millionyuan,

morethan1millionyuanpart,press1%deductapercentagefrom

asumofmoney,

Enterthemonthprofitfromthekeyboard,I,andaskforthe

bonus

1.programanalysis:pleaseuseafewaxestoboundaries,

positioning.Whendefiningthedefinition,youneedtodefine

thebonusasagrowthinteger.

[program13]

Title:aninteger,plus100,isaperfectsquare,plus168is

aperfectsquarenumber.What'sthenumber?

1.programanalysis:judgmentinlessthan100thousand,the

numberofthefirstand100aftertheroot,thenthenumberof

plus268afterprescribing,ifafterprescribingresultsmeet

Thefollowingconditions,thatistheresult.Pleaseseethe

concreteanalysis:

[program14]

Topic:enterayear,amonth,adate,todeterminethedayis

thefirstfewdaysoftheyear?

1.programanalysis:inMarch5th,forexample,thefirsttwo

monthsshouldbeaddedup,andthenplus5days,thatis,the

firstfewdaysoftheyear,specialcircumstances,leapyear,

and

Youneedtoconsideraddingonemoredaytothemonthwhenthe

inputisgreaterthan3.

[program15]

Enterthreeintegersx,y,Z,pleaseputthethreenumberof

smalltolargeoutput.

1.programanalysis:wewouldliketoputthesmallestnumber

ontheX,comparexwithyfirst,ifx>ywillexchangethevalue

ofXandy,andthenuseX

ComparewithZ,ifx>zwillexchangethevalueofXandZ,this

canmakexminimum.

[program16]

Topic:theoutputof9*9formulas.

1.programanalysis:branchandcolumnconsidered,atotalof

91ines,9columns,Icontrol1ine,Jcontrolcolumn.

[program17]

Question:monkeyseatpeachesproblem:monkeyspickedoffafew

peachesonthefirstday,immediatelyatehalf,notaddicted,

andeatasecondday,themorningwillbeleft

Thepeachatehalf,andateonemore.Everymorning,Iatethe

daybefore

TheYibanlingyia.Bythetenthmorning,whenIwantedtoeat

again,Isawonlyonepeachleft.Askforthefirstday.

1.programanalysis:reversethinking,fromthebacktoinfer.

[program18]

Title:twotabletennisteamsplay,eachwiththreeplayers.

Ateamisa,B,Cthree,teamBisx,y,Zthree.Thelistof

matcheshasbeendrawnup.Someoneto

Theteaminquiredaboutthelistofmatches.Asayshedoesn't

comparewithX,andCsayshedoesn，tcomparewithX,Z,and

askstheprogramtofindalistofthethreeteamplayers.

1.programanalysis:determinetheprimenumbermethod:with

anumberofremovalof2tosqrt(thisnumber),ifyoucanbe

divisible,itshowsthatthisnumberisnotprime,inverse

Primenumber.

[program19]

Title:printthefollowingpattern(diamond)

*

***

Tiananmen

Result

Tiananmen

***

*

1.programanalysis:first,thegraphicsaredividedintotwo

partstolookat,thefirstfourlinesofarule,thelatter

threelinesofarule,theuseofdoubleforcycle,thefirst

layerofcontrol

OK,secondlayercontrolcolumn.

[program20]

Title:thereisasequenceoffractions:2/1,3/2,5/3,8/5,

13/8,21/13...Andthesumofthefirst20oftheseries.

1.programanalysis:pleaseseizethelawofchangeofnumerator

anddenominator.

[program21]

Title:1+2,+3,...+...+20...And...

1.programanalysis:Thisprogramjustaccumulatedintoatired

ride.

[program22]

Title:usingrecursivemethodfor5!.

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

[program23]

Title:5peoplesittogetherandaskhowoldarefifthpeople?

Hesaidhewas2yearsolderthanfourth.Askedtheageoffourth,

hesaidhewas2yearsolderthanthird,ask

Thirdpeople,secondyearsolderthantwo.Askedsecondpeople,

saidtwoyearsolderthanthefirstperson.Finallyaskedthe

firstman,hesaid,is10yearsold.Fifth,please

Howoldareyou?

1.programanalysis:theuseofrecursivemethod,recursive

dividedintobackpushandrecursivetwostages.Ifyouwant

toknowtheageoffifth,youmustknowtheageofthefour,

Byanalogy,pushtothefirstperson(10yearsold),thenpush

back.

[program24]

Title:toanomorethan5positiveintegers,requirements:

first,askitisafewdigits,two,thereverseprintoutyour

figures.

[program25]

Title:a5digitnumbertodeterminewhetheritispalindrome.

Thatis,12321isthepalindromenumber,thebitisthesame

asthetens,andthetenbitisthesameasthethousand.

[program26]

Title:Pleaseenterthefirstletteroftheweektodetermine

whatdayitis.Ifthefirstletteristhesame,thencontinue

tojudgethesecondletters.

1.programanalysis:itisbettertousethecasestatement.

Ifthefirstletteristhesame,thenjudgethesecondletters

withthecasestatementortheifstatement.

[program27]

Title:seektheprimenumberwithin100

[program28]

Title:sort10numbers

1.programanalysis:youcanusetheselectionmethod,thatis,

fromthelatter9comparisonprocess,selectaminimumandthe

firstelementoftheexchange,andthenextanalogy,thatis,

withthefirst

Thetwoelementsarecomparedwiththelatter8andexchanged.

[program29]

Title:thesumofthediagonalelementsofa3*3matrix

1.programanalysis:theuseofdoubleforloopcontrolinput

two-dimensionalarray,andthena[i][i]cumulativeoutput.

[program30]

Title:thereisanarrayalreadyingoodorder.Nowentera

number,theoriginallawrequiredtoinsertitintothearray.

1.programanalysis:firstdeterminewhetherthisnumberis

greaterthanthelastnumber,andthenconsidertheinsertion

ofthemiddlenumber,afterinsertingtheelementafterthe

number,

Moveonepositionbackwardinturn.

[program31]

Title:outputanarrayinreverseorder.

1.programanalysis:usethefirstoneandthelastone.

[program32]

Title:takeanintegera,startingfromtherightsideofthe

4〜7bit.

Programanalysis:thiscanbeconsidered:

(1)firstmoveato4bits.

(2)setalow4bit,all1,andtheremaining0.Available

C0«4)

(3)performtheoperationsofthetwoabove.

[program33]

Title:printouttheYangHuitriangle(asktoprintout10lines,

asshownbelow)

1.programanalysis:

One

11

121

1331

14641

15101051

[program34]

Title:enter3numbersa,B,C,outputinsizeorder.

1.programanalysis:usingpointermethod.

[program35]

Title:enterthearray,thelargestwiththefirstelementof

theexchange,thesmallestwiththelastelementoftheexchange,

outputarray.

[program36]

Title:therearenintegers,sothatthefrontofthenumber

ofmovingbackwardmposition,andfinallythenumberofM

becomesthenumberofminthefront

[program37]

Topic:npersonalcircle,orderarranging.Startedfromthe

firstreport(from1to3report),whoreported3peopleout

ofthecircle,askthelasttoleave

Whowastheoriginalnumber?.

[program38]

Title:writeafunctiontofindthelengthofastring,enter

thestringinthemainfunction,andoutputitslength.

[program39]

Title:writeafunction,enterthenisevennumbers,callthe

functionfor1/2+1/4+...+l/n,whentheinputnisodd,call

thefunction

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

[program40]

Title:stringsorting.

[program41]

Topic:thereisapileofpeachesonthebeach,andfivemonkeys

aredivided.Thefirstmonkeydividedthepileofpeachesinto

fiveparts,onemore,andthemonkeyputmorethanone

Onethrewintotheseaandtookone.Thesecondmonkeysdivided

theremainingpeachesintofiveequally,andonemore,andit

threwonemoreintothesea

Takeone,third,fourth,fifthmonkeysdothat,andaskhowmany

peachesarethereonthebeachatleast

[program42]

Title:809*?=800*?+9*?+1?

Amongthem,therepresentativeofthetwodigit,8*,andthe

resultistwodigit,9*,andtheresultis3figures.Beg?

Representtwodigits,

And809*?Aftertheresults.

[program43]

Title:anoddnumberthatcanbecomposedof0-7.

[program44]

Title:anevennumbercanalwaysbeexpressedasthesumoftwo

primenumbers.

[program45]

Title:aprimenumbercanbedividedbyafew9

[program46]

Title:twostringconnectionprogram

[program47]

Title:readthewholenumberof7numbers(1-50),eachread

avalue,theprogramprintoutthevalueofthenumberof*.

[program48]

Title:acompanyusesapublictelephonetotransmitdata.The

dataisanintegeroffourbits.Itisencryptedduringthe

transmission.Theencryptionrulesareasfollows:eachdigit

Bothadd5,thendividethenumberbyandby10insteadofthe

number,thenexchangethefirstbitandthefourthbit,the

secondbitandthethirdbit.

[program49]

Title:howmanytimesdoesstringstringappear?

[program50]

Title:therearefivestudents,eachstudenthas3classesof

results,fromthekeyboardinputoftheabovedata(including

studentnumber,name,threeclassresults),calculated

Averageresults,originaldata,andcalculatedaveragescores

arestoredinthediskfile"stud".

1.Writeadatecalculationprogram.Designrequirements:

(choosetomakeone)

1)amonthisenteredbytheuser,andthemonthcalendaris

displayedonthescreeneveryMonday,andendsfromSundayto

Saturday.

2)enteradatebytheuserandthescreenansweriswhatday

oftheweek.

3)entertwodatesbytheuserandcalculatethedifference

betweenthetwodates.

2,enterastring,statisticsinwhichthenumberofcharacters

appear.

3.Enter3integersfromthekeyboard,andcalculatewhether

thetrianglewiththe3numbersisrighttriangle.

4,inApplettoachievethecalculatorfunction:youcan+,-

*,/fourarithmetic.

1,defineacircleclassthatincludesthemethodofcalculating

theareaofthecircleandthecircumferenceofthecircle.If

theradiusoftheinputislessthan0,acustomexceptionis

thrown.

2.Writeadivisionprogramthatrequiresthedivisorandthe

divisortobeenteredfromthekeyboard.Iftheinputdivisor

isanonnumerictypesuchas6y,theprogramautomatically

interruptsandthrowstheNumberFormatExceptionexception

withoutenteringthedivisorprogram.Iftheinputdivisoris

0,theprogramthrowstheArithmeticExceptionexception.And

usefinallytoprocessthefinalresult.

3,adesignfromthecommandline(keyboard)inputastring

program,ifthestringvalueis"123"exceptionisan

Exceptionl23(custom),anddisplaythe“123stringcausedby

abnormal

1,programmingtocreateaBoxclass,definethreevariables

acubeoflength,widthandheightinthem,andthendefinea

methodsetDemotoinitializethethreevariables,andthen

defineamethodtocalculatethevolumeofacube.Createan

objecttofindthesizeofacubeofagivensize.

2,thetitleofthemethod,setDemoconstructortoachieve

initialization.

3,programmingtocreateaPointclass,definetwovariables

ofcoordinatesofapointvalueinthem,andthendefinea

constructorinitializationastheoriginofcoordinates,and

thendefineamethodtorealizethepointmove,thendefinea

coordinatepointofthecurrentprintmethod.Andcreatean

objectverification.

4,defineaclassthatimplementstheconceptofbankaccounts,

includingvariablessuchasaccountsandbalances.Methods

includedeposits,withdrawals,andquerybalances”.Definethe

mainclass,createtheobjectoftheaccountclass,andcomplete

theappropriateoperation.

5,thedefinitionofthefollowingbasicclasses,requiresthe

realizationofinheritance:point,Cylinder,Circle,class,

cylinder,inheritancepoint,cylinder,inheritancecircle.The

circleradius,thecircleareaandthecylindervolumecanbe

calculated.

6,defineamedia(media)classthatcontainsinformationsuch

asname,author,publisher,andprice,andcanenterthis

informationfromthekeyboard.

Thencreatemediasubclasses:books(Book)andcd.

ProgrammingFibonaccisequence.TheFibonacciseriesis

definedas:

Fl=l,F2=l...

Fn=Fn-l+Fn-2(n>=3)

Tip:thekeycodeisasfollows:

F[0]=f[l]=l;

For(i=2;i<10;i++)

2.,buildanumericarray,calculatetheoddnumbersandall

theoddvalues,and.

3.usingthearraytoachievethebasicfunctionsofthequeue:

Aqueueisabasicdatastructurethatfollowstheprinciple

offirstin,firstout.Thequeueusuallysupportstwobasic

operations:put,get(to)(made),eachputoperationwillbe

anewelementinthequeuetail;eachgetoperationwillbea

newelementtogetthenextelementinthequeueatthebeginning.

Queueelementsareexpendable,andonceanelementhasbeen

obtained,itcannotbeacquiredagain.Ifthequeuehasnospace,

itisfull.Iftherearenoelementsinthequeue,thecolumn

isempty.

4.whatarethedisadvantagesofusingarrays?

(1)usingsimpleifstatementprogramming,typethreeintegers

fromthekeyboard,andthenoutputtheminorderfromsmallto

large.

(2)useif-else-ifstatementsandswitchstatementsto

determinewhichseasonamonthis,respectively.

(3)programmingenterthegradesofstudents,academic

achievements,andgivethecorrespondingachievementrange.

Setalevelof85ormore(including85points);Bclassis70

pointsormore(including70points);Cclassismorethan60

points(including60points);Dclassisbelow60points.Using

theifstatementandtheswitchstatement,respectively.

(4)usingthecontinuestatement:outputthenumbersbetween

100〜300thatcannotbedivisibleby3.

(5)usethebreakstatementtoachievethecount:from1〜100,

whenyoucountto78,theprogramterminates.

(6)usewhile,DO-WHILEandforstatementprogramming

respectively,seekthesumof「100.

(7)usewhile,DO-WHILEandforstatementprogramming

respectively,findoutallnarcissusnumberandoutput.The

numberofdaffodilsisthreedigits,andthecubeofitsnumbers

isequaltothethreedigititself,forexample:

371=33+73+13371isanarcissusnumber.

(8)anintegerisenteredbytheuser,andtheresultisgiven

bytheprogramtodeterminewhetheritisaprimenumberornot.

Orenterarangebytheuser,theprogramlistsalltheprime

numberswithinthatrange

(9)printthefollowingdiagramusingcyclicstatements:

*

***

Miss

xl>

ZTXZTSXTHZivXTS

Thisiswhenourteachergavethetitle,verysystematic,for

youtostudymustbeofgreathelp

sixsi*sixxlxxlxxtxxl*xlxxfxxlzxl*xl*xlxxlxxlxxlxxlzxtxxlxxlxxlxxlxxlxxfxvl*xlxxtxsixxlxxJxxlz*1*xlxxlzxtx*X*xlxxlzxl*xlxxlzxlx

ZTSZTXXjXXTSXT**T*XTXXT**TS✓JXXTX*T*XTSXT**T*XTXXTX**1>XTSZTX^7^*TSXTXXTXXTXXISZTSXTXX7S**1>XT>XTXXTXXTXZjXZTS*TS

x|cx|c

1,respectively,writeApplicationandAppletprogram,display

string"HelloJava”!Welcometouse!”.

2,printyourownnamewith'.Suchas"King"isprintedas

xl*vtxxJxxlxxlxKL*xlzxL*

•THXTS*7*>TXXTSXTXXTX

**

**

x|cx|c

**

**

sL*X,L*sixvl*xlxxl>xtxxlxxlxxlxxJx

xp»*T**T*XTXXTSXT**T**T»XTXZT*

*1**1**£**1**1*xfz*1*xl*xlxsixxl*vt*xl**lz*1^xl*^1**fxsi**lz*lzxl*xlzxl*xl*si**1*xlzxlz*1*xlzxfx*1*si**1**lz*lx*1**X*xlz*X*xlz«Xz

q、*TXXT*(、*7xxTxXTXq、"、XT%XTX/、*TX*T%XT%XTX*TV*T%*TX*7*XT**Tx*T%XTX*TVXTX*T*

*1**1**1**A**lx*lzsi*xt**1**1**1**lz*lx*Ix%lxxlz%I*KIXvlx*X**XZ*1*xl*

ZT%*TX*T*ZT**TX*TX*TXZTX/、ZT**TX*T**TX*TX*TXZTX

1,usingtheBufferedReaderclassfromthekeyboardtoreceive

anintegerandarealnumber,calculatetheirsum,andthen

outputonthescreen.

Tip:thekeysentencesareasfollows:

BufferedReaderDIN=newBufferedReader(new,

InputStreamReader(System,in));

I=Integer.parselnt(din.readLine());

F=Float.parseFloat(din.readLine());

2,throughtheinterfaceinputtwointegers,thegreatest

c