java语言程序设计基础篇英文8版课后习题答案.docx

java语言程序设计基础篇英文8版课后习题答案.docx

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java语言程序设计基础篇英文8版课后习题答案

publicclassExercise1_2{

publicstaticvoidmain（String[]args）{

System.out.println（"WelcometoJava"）;

System.out.println（"WelcometoJava"）;

System.out.println（"WelcometoJava"）;

System.out.println（"WelcometoJava"）;

System.out.println（"WelcometoJava"）;

}

}

publicclassExercise1_4{

publicstaticvoidmain（String[]args）{

System.out.println（"aa^2a^3"）;

System.out.println（"111"）;

System.out.println（"248"）;

System.out.println（"3927"）;

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_1WithDialogBox{

//Mainmethod

publicstaticvoidmain（String[]args）{

//EnteratemperaturinFahrenheit

StringcelsiusString=JOptionPane.showInputDialog（null,

"EnteratemperatureinCelsius:

",

"Exercise2_1Input",JOptionPane.QUESTION_MESSAGE）;

//Convertstringtodouble

doublecelsius=Double.parseDouble（celsiusString）;

//ConvertittoCelsius

doublefahrenheit=（9.0/5）*celsius+32;

//Displaytheresult

JOptionPane.showMessageDialog（null,"Thetemperatureis"+

fahrenheit+"inFahrenheit"）;

}

}

importjava.util.Scanner;

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）;

System.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:

"）;

intnumber=input.nextInt（）;

//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[]）{

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

//EnteranASCIIcode

System.out.print（"EnteranASCIIcode:

"）;

intcode=input.nextInt（）;

//Displayresult

System.out.println（"ThecharacterforASCIIcode"

+code+"is"+（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="Youramount"+amount+"consistsof\n"+

numberOfOneDollars+"dollars\n"+

numberOfQuarters+"quarters\n"+

numberOfDimes+"dimes\n"+

numberOfNickels+"nickels\n"+

numberOfPennies+"pennies";

System.out.println（output）;

}

}

importjavax.swing.JOptionPane;

publicclassExercise2_12a{

publicstaticvoidmain（Stringargs[]）{

//Obtaininput

StringbalanceString=JOptionPane.showInputDialog（null,

"Enterbalance:

"）;

double