java語(yǔ)言程序設(shè)計(jì)基礎(chǔ)篇(英文8版)課后習(xí)題答案

目錄

第一章...........................................................................1

第二章...........................................................................2

第三章...........................................................................8

第四章..........................................................................17

第五章..........................................................................32

第六章..........................................................................47

第一章

publicclassExercise1_2{

publicstaticvoidmain(String[]args){

System.out.println("WelcometoJava");

System.out.println("WeicometoJava1');

System.out.println(HWelcometoJava1');

System.out.println(nWelcometoJava1');

System.out.println("WelcometoJava");

)

)

publicclassExercisel_4{

publicstaticvoidmain(String[]args){

System.out.println(naaA2aA3");

System.out.println(',l11")；

System.out.println("248")；

System.out.println(n3927");

System.out.println("41664");

)

}

publicclassExercise1_6{

publicstaticvoidmain(String[]args){

System.out.println(1+2+3+4+5+6+7+8+9);

)

)

publicclassExercise1_8{

publicstaticvoidmain(String[]args){

//Displayarea

System.out.println(5.5*5.5*3.14159);

//Displayperimeter

System.out.println(2*5.5*3.14159);

importjavax.swing.JOptionPane;

publicclassExercise2_lWithDialogBox{

//Mainmethod

publicstaticvoidmain(String[]args){

//EnteratemperaturinFahrenheit

StringcelsiusString=JOptionPane.showInputDialog(null,

"EnteratemperatureinCelsius:',,

nExercise2_lInput11,JOptionPane.QUESTION_MESSAGE);

//Convertstringtodouble

doubleCelsius=Double.parseDouble(celsiusString);

//ConvertittoCelsius

doublefahrenheit=(9.0/5)*Celsius+32;

//Displaytheresult

JOptionPane.showMessageDialog(null,"Thetemperatureis"+

fahrenheit+ninFahrenheit1');

)

}

importjava.util.Scanner;

第二章

publicclassExercise2_2{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Enterradiusofthecylinder

System.out.print("Enterradiusofthecylinder:");

doubleradius=input.nextDouble();

//Enterlengthofthecylinder

System.out.print("Enterlengthofthecylinder:”)；

doublelength=input.nextDouble();

doublevolume=radius*radius*3.14159*length;

System.out.println('Thevolumeofthecylinderis"+volume);

publicclassExercise2_4{

publicstaticvoidmain(String[]args){

//Prompttheinput

java.util.Scannerinput=newjava.util.Scanner(System.in);

Systern.out.print("Enteranumberinpounds:");

doublepounds=input.nextDouble();

doublekilograms=pounds*0.454;

System.out.println(pounds+"poundsis"+kilograms+"kilograms");

)

)

//Exercise2_6.java:Summarizealldigitsinaninteger<1000

publicclassExercise2_6{

//Mainmethod

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//Readanumber

System.out.print('*Enteranintegerbetween0and1000:M);

intnumber=input.nextlnt();

//Findalldigitsinnumber

intlastDigit=number%10;

intremainingNumber=number/10;

intsecondLastDigit=remainingNumber%10;

remainingNumber=remainingNumber/10;

intthirdLastDigit=remainingNumber%10;

//Obtainthesumofalldigits

intsum=lastDigit+secondLastDigit+thirdLastDigit;

//Displayresults

System.out.println('Thesumofalldigitsin"+number

+"is"+sum);

)

)

publicclassExercise2_8{

publicstaticvoidmain(Stringargs[J){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//EnteranASCIIcode

System.out.print(HEnteranASCIIcode:");

intcode=input.nextlnt();

//Displayresult

System.out.printlnC^hecharacterforASCIIcode”

+code+Mis"+(char)code);

)

)

importjava.util.Scanner;

publicclassExercise2_10{

/**Mainmethod*/

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Receivetheamountenteredfromthekeyboard

System.out.print("Enteranamountindouble,forexample11.56");

doubleamount=input.nextDouble();

intremainingAmount=(int)(amount*100);

//Findthenumberofonedollars

intnumberOfOneDollars=remainingAmount/100;

remainingAmount=remainingAmount%100;

//Findthenumberofquartersintheremainingamount

intnumberOfQuarters=remainingAmount/25;

remainingAmount=remainingAmount%25;

//Findthenumberofdimesintheremainingamount

intnumberOfDimes=remainingAmount/10;

remainingAmount=remainingAmount%10;

//Findthenumberofnickelsintheremainingamount

intnumberOfNickels=remainingAmount/5;

remainingAmount=remainingAmount%5;

//Findthenumberofpenniesintheremainingamount

intnumberOfPennies=remainingAmount;

//Displayresults

Stringoutput="YouramountM+amount+"consistsof\nM+

numberOfOneDollars+Mdollars\nH+

numberOfQuarters+"quarters\n"4-

numberOlDimes+"dimes\n"+

numberOfNickels+°nickels\n"+

numberOfPennies+"pennies'1;

System.out.println(output);

)

)

importjavax.swing.JOptionPane;

publicclassExercise2_12a{

publicstaticvoidmain(Stringargs[]){

//Obtaininput

StringbalanceString=JOptionPane.showInputDialog(null,

"Enterbalance:");

doublebalance=Doubie.parseDouble(balanceString);

StringinterestRateString=JOptionPane.showInputDialog(null,

*'Enterannualinterestrate:");

doubleannualInterestRate=Double.parseDouble(interestRateString);

doublemonthlylnterestRate=annuallnterestRate/1200;

doubleinterest=balance*monthlylnterestRate;

//Displayoutput

JOptionPane.showMessageDialog(null,"Theinterestis0+

(int)(100*interest)/100.0);

)

)

importjava.util.Scanner;

publicclassExercise2_12b{

publicstaticvoidmain(Stringargs[]){

Scannerinput=newScanner(System.in);

//Obtaininput

System.out.print("Enterbalance:");

doublebalance=input.nextDouble();

System.out.print("Enterannualinterestrate:")；

doubleannuallnterestRate=input.nextDouble();

doublemonthlylnterestRate=annuallnterestRate/1200;

doubleinterest=balance*monthlylnterestRate;

//Displayoutput

System.out.prinlln('Theinterestis"+(int)(100*interest)/100.0);

importjava.util.Scanner;

publicclassExercise2_l4{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Prompttheusertoenterweightinpounds

System.out.print("Enterweightinpounds:");

doubleweight=input.nextDouble();

//Prompttheusertoenterheightininches

System.out.print(nEnterheightininches:")；

doubleheight=input.nextDouble();

doublebmi=weight*0.45359237/(height*0.0254*height*0.0254);

System.out.print(nBMIisM+bmi);

}

)

publicclassExercise2_16{

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

System.out.print(

"Entertheamountofwaterinkilograms:")；

doublemass=input.nextDouble();

System.out.print("Entertheinitialtemperature:")；

doubleinitialTemperature=input.nextDouble();

System.out.print(

"Enterthefinaltemperature:'*);

doublefinalTemperature=input.nextDouble();

doubleenergy=

mass*(finalTemperature-initialTemperature)*4184;

System.out.print("Theenergyneededis"+energy);

)

)

publicclassExercise2_18{

//Mainmethod

publicstaticvoidmain(String[]args){

System.out.printlnC^bpow(a,b)H);

System.out.println(nl2”+(int)Math.pow(l,2));

System.out.println("23”+(int)Math.pow(2,3));

System.out.println("34”+(int)Math.pow(3,4));

System.out.println(,r45"+(int)Math.pow(4,5));

System.out.println(H56”+(int)Math.pow(5,6));

importjava.util.Scanner;

publicclassExercise2_20)

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Enterthefirstpointwithtwodoublevalues

System.out.print(''Enterxlandyl:");

doublexl=input.nextDouble();

doubleyl=input.nextDouble();

//Enterthesecondpointwithtwodoublevalues

System.out.print(HEnterx2andy2:”)；

doublex2=input.nextDouble();

doubley2=input.nextDouble();

//Computethedistance

doubledistance=Math.pow((xl-x2)*(xl-x2)+

(yl-y2)*(yl-y2),0.5);

System.out.printl^'Thedistanceofthetwopointsis"+

distance);

)

)

importjava.util.Scanner;

publicclassExercise2_22)

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Enterthesideofthehexagon

System.out.print(HEntertheside:")；

doubleside=input.nextDouble();

//Computethearea

doublearea=3*1.732*side*side/2;

System.out.println('Theareaofthehexagonis"+area);

)

)

importjava.util.Scanner;

publicclassExercise2_24{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

System.out.print("Enterspeedv:");

doublev=input.nextDouble();

System.out.print(nEnteraccelerationa:");

doublea=input.nextDouble();

doublelength=v*v/(2*a);

System.out.printlnC'Theminimumrunwaylengthforthisairplaneis"+

length+"meters");

)

)

第三章

publicclassExercise3_2{

method*/

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//Prompttheusertoenteraninteger

System.out.print('*Enteraninteger:")；

intnumber=input.nextlnt();

//Displayresults

Systern.out.println('Is"+number+"anevennumber?"+

(number%2==0));

)

)

importjavax.swing.*;

publicclassExercise3_4{

publicstaticvoidmain(String[]args){

intnumber1=(int)(System.currentTimeMillis()%100);

intnumber2=(int)(System.currentTimeMillis()*7%100);

StringresultString=JOptionPane,showlnputDialog

(nWhatis”+number1+“+”+number2+“？”)；

intresult=Integer.parselnt(resultString);

JOptionPane.showMessageDialog(null,

numberl+”+”+number2+“="+result+"is"+

(number1+number2==result));

)

)

importjavax.swing.*;

publicclassExercise3_5WithJOptionPane{

publicstaticvoidmain(String[]args){

intnumberl=(int)(System.currentTimeMillis()%10);

intnumber2=(int)(System.currentTimeMillis()*7%10);

intnumber3=(int)(System.currentTimeMillis()*3%10);

StringanswerString=JOptionPane.showInputDialog

(nWhatis"+numberl+“+”+number2+“+”+

number3+“？”)；

intanswer=Integer.parselnt(answerString);

JOptionPane.showMessageDialog(null,

numberl+”+“+number2+"+"+number3+"="+answer+°is"+

(numberl+number2+number3==answer));

)

)

importjava.util.Scanner;

publicclassExercise3_6{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Prompttheusertoenterweightinpounds

System.out.print(''Enterweightinpounds:")；

doubleweight=input.nextDouble();

//Prompttheusertoenterheight

System.out.print(HEnterfeet:");

doublefeet=input.nextDouble();

System.out.print(''Enterinches:")；

doubleinches=input.nextDouble();

doubleheight=feet*12+inches;

//ComputeBMI

doublebmi=weight*0.45359237/

((height*0.0254)*(height*0.0254));

//Displayresult

System.out.println(nYourBMIisn+bmi);

if(bmi<16)

System.out.println("Youareseriouslyunderweight11);

elseif(bmi<18)

System.out.println(nYouareunderweight'1);

elseif(bmi<24)

System.out.println("Youarenormalweight1');

elseif(bmi<29)

System.out.println("Youareoverweight")；

elseif(bmi<35)

System.out.println(nYouareseriouslyoverweight'1);

else

System.out.println("Youaregravelyoverweight");

)

)

publicclassExercise3_8{

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//Enterthreenumbers

System.out.printC'Enterthreeintegers:");

intnuml=input.nextlnt();

intnum2=input.nextlnt();

intnum3=input.nextlnt();

if(numl>num2){

inttemp=numl;

numl=num2;

num2=temp;

)

if(num2>num3){

inttemp=num2;

num2=num3;

num3=temp;

if(numl>num2){

inttemp=numl;

numl=num2;

num2=temp;

}

System.out.printl^'Thesortednumbersare”

+numl+”"+num2+"”+num3);

}

)

importjavax.swing.JOptionPane;

publicclassExercise3_10{

publicstaticvoidmain(String[]args){

//1.Generatetworandomsingle-digitintegers

intnumber1=(int)(Math.random()*10);

intnumber2=(int)(Math.random()*10);

//2.Promptthestudenttoanswer指hatisnumberl+number2??StringanswerString

JOptionPane.showInputDialog

("Whatis"+numberl+"+"+number2+

intanswer=Integer.parselnt(answerString);

//4.Gradetheannseranddisplaytheresult

StringreplyString;

if(numberl+number2==answer)

replyString="Youarecorrect!";

else

replyString="YouransweriswrongAn"+numberl+"+”

+number?+“shouldbe"+(numberl+number2);

JOptionPane.showMessageDialog(null,replyString);

}

)

importjava.util.Scanner;

publicclassExercise3_12{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Prompttheusertoenteraninteger

System.out.print("Enteraninteger:")；

intnumber=input.nextlnt();

if(number%5==0&&number%6=0)

System.out.println(number+"isdivisiblebyboth5and6");

elseif(number%5==0Anumber%6==0)

System.out.println(number+"isdivisiblebyboth5and6,butnotboth");

else

System.out.println(number+Misnotdivisiblebyeither5or6M);

)

)

publicclassExercise3_14{

publicstaticvoidmain(String[]args){

//Obtaintherandomnumber0or1

intnumber=(int)(Math.random()*2);

//Prompttheusertoenteraguess

java.util.Scannerinput=newjava.util.Scanner(System.in);

System.out.print(''Guessheadortail?"+

"Enter0forheadand1fortail:");

intguess=input.nextlnt();

//Checktheguess

if(guess==number)

System.out.println("Correctguess");

elseif(number==0)

System.out.println("Sorry,itisahead");

else

System.out.println("Sorry,itisatail1');

}

)

publicclassExercise3_16{

publicstaticvoidmain(String[]args){

System.out.println((char)('A'+Math.random()*27));

)

)

importjava.util.Scanner;

publicclassExercise3_18{

/**Mainmethod*/

publicstaticvoidmain(Stringargs[]){

Scannerinput=newScanner(System.in);

//Prompttheusertoenterayear

System.out.print("Enterayear:")；

//Convertthestringintoanintvalue

intyear=input.nextlnt();

//Checkiftheyearisaleapyear

booleanisLeapYear=

((year%4==0)&&(year%100!=0))II(year%400==0);

//Displaytheresultinamessagedialogbox

System.out.println(year+nisaleapyear?”+isLeapYear);

)

)

publicclassExercise3_20{

//Mainmethod

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//EnterthetemperatureinFahrenheit

System.out.print("EnterthetemperatureinFahrenheit:");

doublefahrenheit=input.nextDouble();

if(fahrenheit<-58IIfahrenheit>41){

System.out.println("Temperaturemustbebetween-58撼and41擒)

System.exit(O);

)

//Enterthewindspeedmilesperhour

System.out.print("Enterthewindspeedmilesperhour:");

doublespeed=input.nextDouble();

if(speed<2){

System.out.println(nSpeedmustbegreaterthanorequalto2")；

System.exit(O);

)

//Computewindchillindex

doublewindChilllndex=35,74+0.6215*fahrenheit-35.75*

Math.pow(speed,0.16)+0.4275*fahrenheit*

Math.pow(speed,0.16);

//Displaytheresult

System.out.println(nThewindchillindexis"+windChilllndex);

importjava.util.Scanner;

publicclassExercise3_22{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Enterapointwithtwodoublevalues

System.out.print(MEnterapointwithtwocoordinates:'*);

doublex=input.nextDouble();

doubley=input.nextDouble();

//Computethedistance

doubledistance=Math.pow(x*x+y*y,0.5);

if(distance<=10)

System.out.println(MPoint(n+x+"，"+y+

")isinthecircle");

else

System.out.println(nPoint("+x+","+y+

“)isnotinthecircle");

)

}

publicclassExercise3_24{

publicstaticvoidmain(String[]args){

finalintNUMBER_OF_CARDS=52;

//Pickacard

intnumber=(int)(Math.random()*NUMBER_OF_CARDS);

System.out.print("Thecardyoupickedis");

if(number%13==0)

System.out.print("AceofM);

elseif(number%13=10)

System.out.print。'Jackof");

elseif(number%13==11)

System.out.print(nQueenofn);

elseif(number%13=12)

System.out.print(nKingof");

else

System.out.print((number%13)+"of");

if(number/i3==0)

System.out.println(MClubsn);

elseif(number/13==1)

System.out.println(nDiamondsn);

elseif(number/13==2)

System.out.println("HeartsM);

elseif(number/13==3)

System.out.println("Spades");

)

)

publicclassExercise3_26{

publicstaticvoidmain(String[]args){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//Enteraninteger

System.out.print(MEnteraninteger:")；

intnumber=input.nextlnt();

System.out.println(nIsn+number+"divisibleby5and6?"+

((number%5==0)&&(number%6==0)));

System.out.println(nIs"+number+ndivisibleby5or6?"+

((number%5==0)II(number%6==0)));

System.out.println(HIs"+number+

"divisibleby5or6,butnotboth?"+

((number%5==0)A(number%6==0)));

)

)

importjava.util.Scanner;

publicclassExercise3_28{

publicstaticvoidmain(Stringargs[]){

Scannerinput=newScanner(System.in);

System.out.print("Enterrl擔(dān)centerx-,y-coordinates,width,andheight:");

doublex1=input.nextDouble();

doubleyl=input.nextDouble();

doublewl=input.nextDouble();

doublehl=input.nextDouble();

System.out.print(MEnterr2擔(dān)centerx-,y-coordinates,width,andheight:'*);

doublex2=input.nextDouble();

doubley2=input.nextDouble();

doublew2=input.nextDoubie();

doubleh2=input.nextDouble();

doublexDistance=x1-x2>=0?x1-x2:x2-x1;

doubleyDistance=y1-y2>=0?y1-y2:y2-y1;

if(xDistance<=(wl-w2)/2&&yDistance<=(hl-h2)/2)

System.out.println(nr2isinsiderlM);

elseif(xDistance<=(wl+w2)/2&&yDistance<=(hl+h2)/2)

System.out.println(Mr2overlapsrl1');

else

System.out.println(nr2doesnotoverlaprlM);

)

)

importjava.util.Scanner;

publicclassExercise3_30{

publicstaticvoidmain(String[]args){

//PrompttheusertoenterthetimezoneoffsettoGMT

Scannerinput=newScanner(System.in);

System.out.print(HEnterthetimezoneoffsettoGMT:*');

longtimeZoneOffset=input.nextlnt();

//Obtainthetotalmillisecondssincethemidnight,Jan1,1970

longtotalMilliseconds=System.currentTimeMiIlis();

//Obtainthetotalsecondssincethemidnight,Jan1,1970

longtotalSeconds=totalMilliseconds/1000;

//Computethecurrentsecondintheminuteinthehour

longcurrentSecond=totalSeconds%60;

//Obtainthetotalminutes

longtotalMinutes=totalSeconds/60;

//Computethecurrentminuteinthehour

longcurrentMinute=totalMinutes%60;

//Obtainthetotalhours

longtotalHours=totalMinutes/60;

//Computethecurrenthour

longcurrentHour=(totalHours+timeZoneOffset)%24;

//Displayresults

System.out.print("Currenttimeis+(currentHour%12)+”:"

+currentMinute++currentSecond);

if(currentHour<12)

System.out.println(HAMH);

else

System.out.printlnC*PM");

第四章

publicclassExercise4_2{

publicstaticvoidmain(String[]args){

intcorrectCount=0;//Countthenumberofcorrectanswers

intcount=0;//Countthenumberofquestions

java.util.Scannerinput=newjava.util.Scanner(System.in);

longstartTime=System.currentTimeMillis();

while(count<10){

//1.Generatetworandomsingle-digitintegers

intnumberl=1+(int)(Math.random()*15);

intnumber?=1+(int)(Math.random()*15);

//2.Promptthestudenttoanswer揩hatisnumberl?number2??

System.out.print("Whatis"+numberl+"+”+number?+

intanswer=input.nextlnt();

//3.Gradetheansweranddisplaytheresult

StringreplyString;

if(numberl+number2==answer){

replyString="Youarecorrect!1';

correctCount++;

else{

replyString="YouransweriswrongAn"+numberl+”+

+number2+”shouldbe"+(numberl+number2);

System.out.println(replyString);

//Increasethecount

count++;

System.out.println("Correctcountis"+correctCount);

longendTime=System.currentTimeMillis();

System.out.printlnC'Timespentis"+(endTime-startTime)/1000+nseconds");

)

)

publicclassExercise4_4{

publicstaticvoidmain(String[]args){

System.out.println("Miles\t\tKilometers”);

System.out.println("--------------------------")；

//Usewhileloop

intmiles=1;

while(miles<=10){

System.out.println(miles+n\t\t"+miles*1.609);

miles++;

)

/**Alternativelyuseforloop

for(intmiles=1;miles<=10;miles++){

System.out.println(miles+n\t\tn+miles*1.609);

)

*/

)

)

publicclassExercise4_6{

publicstaticvoidmain(String[]args){

System.out.printf(',%10s%10sI%10s%10s\n","Miles'1,"Kilometers'1,

“Kilometers"，“Miles”)；

System.out.println("-----------------------------------------------")；

//Usewhileloop

intmiles=1;intkilometers=20;intcount=1;

while(count<=10){

System.out.printf(,,%10d%10.3fI%10d%10.3f\n",miles,miles*1.609,

kilometers,kilometers/1.609);

miles++;kilometers+=5;count++;

)

/*Useforloop

intmiles=1;intkilometers=20;

for(intcount=1;count<=10;miles++,kilometers+=5,count++){

System.out.printf("%10d%10.3fI%10d%10.3f\n",miles,miles*1.609,

kilometers,kilometers/1.609);

*/

)

importjava.util.*;

publicclassExercise4_8{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

//Prompttheusertoenterthenumberofstudents

System.out.print(

"Enterthenumberofstudents:n);

intnumOfStudents=input.nextlnt();

System.out.print(

“Enterastudentname:")；

Stringstudent1=input.next();

System.out.print(

"Enterastudentscore:");

doublescore1=input.nextDouble();

for(inti=0;i<numOfStudents-1;i++){

System.out.print(

''Enterastudentname:");

Stringstudent=input.next();

System.out.print(

"Enterastudentscore:")；

doublescore=input.nextDouble();

if(score>score1){

student1=student;

score1=score;

)

)

System.out.println('Topstudentn+

student1+M,sscoreis"+score1);

)

)

publicclassExercise4_10{

publicstaticvoidmain(String[]args){

intcount=1;

for(inti=100;i<=1000;i++)

if(i%5=0&&i%6==0)

System.out.print((count++%10!=0)?i+Hi+"\nn);

)

)

/**Findthesmallestnumbersuchthatn*n<12000*1

publicclassExercise4_12{

//Mainmethod

publicstaticvoidmain(String[]args){

inti=1;

while(i*i<=12000){

i++；

)

System.out.prinUn("Thisnumberis"+i);

publicclassExercise4_l4{

publicstaticvoidmain(String[]args){

intcount=1;

for(inti=T;i<Ti++){

System.out.print((count++%10!=0)?(char)i+"":

(char)i+”\n")；

)

)

)

publicclassExercise4_16{

//Mainmethod

publicstaticvoidmain(Stringargs[]){

java.util.Scannerinput=newjava.util.Scanner(System.in);

//Prompttheusertoenterapositiveinteger

System.out.print(

"Enterapositiveinteger:");

intnumber=input.nextlnt();

//Findallthesmallestfactorsoftheinteger

Systern.out.println('Thefactorsfor"+number+"is");

intfactor=2;

while(factor<=number){

if(number%factor==0){

number=number/factor;

System.out.println(factor);

)

else{

factor++;

publicclassExercise4_20{

//Mainmethod

publicstaticvoidmain(String[]args){

intcount=1;//Countthenumberofprimenumbers

intnumber=2;//Anumbertobetestedforprimeness

booleanisPrime=true;//Ifthecurrentnumberisprime?

System.out.println('Theprimenumbersfrom2to1000are\n");

//Repeatedlytestifanewnumberisprime

while(number<=1000){

//Assumethenumberisprime

isPrime=true;