java 程序设计报告.docx

java 程序设计报告.docx

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java程序设计报告

Course:

Javaprogrammingreport

TheFirstExperiment—Javaprogrammingbasic

Q1.Install,configureandtestJDK,thenoutput“helloworld”inthecommandwindow.

Steps:

First,downloadandinstallJDK.

Second,configurethepathinyourcomputer.

Third,writethecodesinnotepadandsetit’ssuffixto.java.Thenyouwillfindtherewillbeadocumentinyourcomputerandit’ssuffixis.class.

Finally,input“javactest.java”inthecommendwindowofyourcomputer,andtheninput“javatest”,andtheresultwilldisplayonthescreen.

Codes:

publicclasstest{

publicstaticvoidmain（String[]args）{

System.out.println（"helloworld"）;

}

}

Screenshots:

Fig1.1

Q2.InstallanduseEclipsetooutput“helloworld”.

Steps:

First,downloadandinstallEclipse.

Then,writethecodesintheclassyouhaveestablish.

Finally,runthecodesandyouwillseetheresult.

Codes：

packagejava_code;

publicclasst{

publicstaticvoidmain（String[]args）{

System.out.println（"helloworld"）;

}

}

Screenshots:

Fig2.1

Q3.OutputyourNameandStudentIDNumber.

Codes:

packagejava_code;

publicclasst{

publicstaticvoidmain（String[]args）{

System.out.println（"Ruanzhenyao"）;

System.out.println（"1341903111"）;

}

}

Screenshots:

Fig3.1

Q4.InputfourintitemsnamedAge,Math,EnglishandHistoryfromyourkeyboard,giveapromptifanyitem’sinputisnotcorrect.

Codes:

packagejava_code;

importjava.util.Scanner;

publicclasstest_4{

publicstaticvoidmain（String[]args）{

Scannersc=newScanner（System.in）;

//ItisaBytestream.

System.out.println（"pleaseinputage,math,english,history"）;

intage=sc.nextInt（）;//readaintegervariable

doublemath=sc.nextDouble（）;

//readaintegervariable

doubleenglish=sc.nextDouble（）;

//readaintegervariable

doublehistory=sc.nextDouble（）;

//readaintegervariable

sc.close（）;

//endtheinput

Try{

System.out.println（"age：

"+age）;

System.out.println（"math"+math）;

System.out.println（"english"+english）;

System.out.println（"history"+history）;

}

//Iftheinputisright,thesecodeswillbeexecuted.

catch（NumberFormatExceptione）

//Iftheinputiswrong,thecodesbelowwillbeexecuted.

{

System.out.println（"it'snotanumber"）;

}

}

}

Fig4.1

Q5.ReadArraysUtil.javacarefully,addthepropercommentsintheprogram,andfinallyanalyzetheresultwithyourownwords.

Codes:

packagejava_code;

importjava.util.Arrays;//ItincludesaclassnamedArrays。

importjava.util.Scanner;

publicclasstest_te{

publicstaticvoidmain（String[]args）{

double[]X=newdouble[5];

//Itisadefinitionofaarray,andithasfivesnumbers.

System.out.println（"pleaseinputthenumbers:

"）;

Scannersc=newScanner（System.in）;

for（inti=0;i

X[i]=sc.nextDouble（）;

sc.close（）;

Arrays.sort（X）;

//Theclasscansortthearray.

System.out.println（"aftersortX:

"+Arrays.toString（X））;double[]Y=Arrays.copyOfRange（X,2,4）;

//CopytheelementsofXarraytoYarray,andit’ssubscript

fromtwotofour.

System.out.println（"copyY:

"+Arrays.toString（Y））;

double[]Z=Arrays.copyOf（X,10）;

//CopythefirsttenelementsfromXtoZ.Ifthereareno

TenelementsinX,itcanbereplacedbyzero.

System.out.println（"copyZ:

"+Arrays.toString（Z））;

double[]W=newdouble[10];

System.arraycopy（X,1,W,2,4）;

//CopytheelementsofXandthesubscriptshouldstartfromone.

ThenputthemintheW,andit’ssubscriptshouldstartfromtwo.

Thenumberoftheelementscopiedisfour.

System.out.println（"copyW:

"+Arrays.toString（W））;

intpos=Arrays.binarySearch（X,5）;

//BinarySearchisusedtoreturnthesubscriptoftheelementfive.

if（pos>0）

System.out.println（"5isX's"+pos+"position"）;

if（Arrays.equals（Y,W））

//Arrays.equalsisusedtocheckwhetherXarrayisequalstotheYarray.

System.out.println（"YisequalstoW"）;

else

System.out.println（"YisNOTequalstoW"）;

}

}

Screenshots:

Fig5.1

Q6.Inputaparticularyearfromyourkeyboardandcheckwhetheritisaleapyear.

Codes:

packagejava_code;

importjava.util.Scanner;

publicclasstest_6{

publicstaticvoidmain（String[]args）{

Scannersc=newScanner（System.in）;

System.out.println（"pleaseinputaparticularyear"）;

intyear=sc.nextInt（）;

if（（year%4==0）&&（year%100==0）||（year%400）==0）

//Iftheparticularyearcanbedividedexactlybyfourandone

hundred,oritcanbedividedexactlybyfourhundred,itisaleapyear.

{

System.out.println（+year+"isaleapyear."）;}

//Ifnot,itisn’taleapyear.

else{

System.out.println（+year+"isnotaleapyear"）;

}

}}

Screenshots:

Fig6.1

Fig6.2

Q7.Inputaparticularyearandmonthfromyourkeyboard,andthenoutputhowmanydaysthismonthhas.

Codes:

packagejava_code;

importjava.util.Scanner;

publicclasstest_7{

publicstaticvoidmain（String[]args）{

Scannersc=newScanner（System.in）;

System.out.println（"pleaseinputaparticularyear"）;

intyear=sc.nextInt（）;

System.out.println（"pleaseinputamonth"）;

intmonth=sc.nextInt（）;

intdays=0;

switch（month）

//Wecanuseswitchtodividedthemonthsintovarioussituations.

{case1:

case3:

case5:

case7:

case8:

case10:

case12:

System.out.println（"31days"）;

break;

case4:

case6:

case9:

case11:

System.out.println（"30days"）;

break;

case2:

if（（year%4==0）&&（year%100==0）||（year%400）==0）

System.out.println（"29days"）;

//Ifitisaleapyear,Februaryhastwenty-ninedays.

else

System.out.println（"28days"）;

//Ifitisnotaleapyear,Februaryhastwenty-eightdays.

break;

default:

System.out.println（"inputiserror"）;

System.out.println（+year+"year"+month+"allhave"+days+"days"）;

}

}

}

Screenshots:

Fig7.1

Fig7.2

Q8.Inputfivearbitraryintegersfromyourkeyboard,andoutputthemfromsmallesttolargest,notethatonlyifstructurecanbeemployedinyourprogram.

Codes:

packagejava_code;

importjava.util.Scanner;

publicclasstest_8{

publicstaticvoidmain（String[]args）{

Scannerin=newScanner（System.in）;

System.out.println（"inputfivenumbers"）;

int[]array=newint[5];

//Itisadefinitionofanarray,andithasfivenumbers.

for（inti=0;i<5;i++）{

array[i]=in.nextInt（）;

}

//Inputfivenumbers.

System.out.println（"beforesort:

"）;

for（inti=0;i<5;i++）

System.out.print（array[i]+""）;

//Outputthearraybeforeitissorted.

System.out.println（）;

for（inti=0;i<5;i++）{

for（intj=i;j<5;j++）{

if（array[i]>array[j]）

{intt=array[i];

array[i]=array[j];

array[j]=t;}

}

}

//Comparethefirsttwoelementsandputthesmalloneinthefirstposition.Thencomparetherestlikethis.

System.out.println（"aftersort:

"）;

for（inta=0;a<5;a++）{

System.out.print（array[a]+","）;}

//Useaforlooptooutputthearray.

System.out.println（）;

}

}

Screenshots:

Fig8.1

Q9.Sortanintarraybythebubbleandselectionalgorithms,thecapacityofthearrayshouldbenolessthan10.

Codes:

packagejava_code;

publicclasstest_9{

publicstaticvoidmain（String[]args）{

int[]array={12,23,4,7,9,42,19,38,33,20,10,47};

//Itisadefinitionofaknownarray.

for（inti=0;i<12;i++）{

intmin=i;

for（intj=i+1;j<12;j++）{

if（array[j]

min=j;

}

}

//Thisisthewaycalledselectionsorting.Firstselectthesmallestelementandputitinthefirstposition.Then,selectthesmallestfromtherestelements,andsoon.

intt=array[i];

array[i]=array[min];

array[min]=t;}

System.out.println（"selectionsort"）;

for（inta=0;a

System.out.print（array[a]+""）;

}

//Useaforloopoutputthearraywhichhasbeensorted.

System.out.println（）;

System.out.println（"bubblesort"）;

for（inta=0;a

System.out.print（array[a]+""）;

}

}

}

Screenshots:

Fig9.1

Q10.Outputallprimesandnon-primesinanintarrayrespectively,thecapacityofthearrayshouldbenolessthan10.

Codes:

packagejava_code;

publicclasstest_24{

publicstaticvoidmain（String[]args）{

for（inti=1;i<=30;i++）{

booleanflag=true;

for（intj=2;j<=i/2;j++）{

if（i%j==0）{

flag=false;

break;

}

}

//Itisusedtofindalltheprimesfromonetothirty.Everynumbershouldbedividedfromonetoitself.Ifitcanbedividedexactlybyanynumberwhichissmallertoitself,itisnotaprimenumber.Else,itisaprimenumberanditwillbeoutput.

if（flag）{

System.out.print（""+i）;

}

}

System.out.println（）;

for（inti=1;i<=30;i++）{

booleanflag=false;

for（intj=2;j<=i/2;j++）{

if（i%j==0）{

flag=true;

break;

}

}

//Ifitisnotaprime,outputit.

if（flag）{

System.out.print（""+i）;

}

}

}

}

Screenshots:

Fig10.1

Q11.Inputanintegerfromyourkeyboardandcheckwhetheritisapalindromenumber.

Codes:

packagejava_code;

importjava.util.Scanner;

publicclasstest_11{

publicstaticvoidmain（String[]args）{

Scannerin=newScanner（System.in）;

System.out.println（"pleaseinputanumber"）;

intInput=in.nextInt（）;

inti=0;

intsum=0;

intr=Input;

while（true）

//Whenthenumberisnotequaltozero,itwillexecutethecodesbelow.

{

i=Input%10;

sum=sum*10+i;

Input/=10;

if（Input==0）break;

}

//First,takethelastdigitfromthenumberyouinput,andmultiplythisnumberbyten,andsoon.Thenyouwillgetareversenumberofit.Ifthereversenumberisequaltothenumberyouhaveinput,itisapalindrome.

if（sum==r）System.out.println（"ispalin