《Java语言程序设计基础篇》第10版 梁勇 著第十章练习题答案Word下载.docx
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publicintgetHour（）{
returnhour;
publicintgetMinute（）{
returnminute;
publicintgetSecond（）{
returnsecond;
publicvoidsetTime（longelapsedTime）{
//Obtainthetotalsecondssincethemidnight,Jan1,1970
longtotalSeconds=elapsedTime/1000;
//Computethecurrentsecondintheminuteinthehour
second=（int）（totalSeconds%60）;
//Obtainthetotalminutes
longtotalMinutes=totalSeconds/60;
//Computethecurrentminuteinthehour
minute=（int）（totalMinutes%60）;
//Obtainthetotalhours
inttotalHours=（int）（totalMinutes/60）;
//Computethecurrenthour
hour=（int）（totalHours%24）;
10.2
publicclassExercise10_02{
BMIbmi1=newBMI（"
JohnDoe"
18,145,5,10）;
TheBMIfor"
+bmi1.getName（）+"
is"
+bmi1.getBMI（）+"
+bmi1.getStatus（））;
BMIbmi2=newBMI（"
PeterKing"
215,5,10）;
+bmi2.getName（）+"
+bmi2.getBMI（）+"
+bmi2.getStatus（））;
staticclassBMI{
privateStringname;
privateintage;
privatedoubleweight;
//inpounds
privatedoubleheight;
//ininches
publicfinaldoubleKILOGRAMS_PER_POUND=0.45359237;
publicfinaldoubleMETERS_PER_INCH=0.0254;
/**ConstructaBMIwiththespecifiedname,age,weight,
*feetandinches
*/
publicBMI（Stringname,intage,doubleweight,doublefeet,doubleinches）{
this.name=name;
this.age=age;
this.weight=weight;
this.height=feet*12+inches;
publicBMI（Stringname,intage,doubleweight,doubleheight）{
this.height=height;
publicBMI（Stringname,doubleweight,doubleheight）{
this（name,20,weight,height）;
publicdoublegetBMI（）{
doublebmi=weight*KILOGRAMS_PER_POUND/
（（height*METERS_PER_INCH）*（height*METERS_PER_INCH））;
returnMath.round（bmi*100）/100.0;
publicStringgetStatus（）{
doublebmi=getBMI（）;
if（bmi<
16）
return"
seriouslyunderweight"
;
elseif（bmi<
18）
underweight"
24）
normalweight"
29）
overweight"
35）
seriouslyoverweight"
else
gravelyoverweight"
publicStringgetName（）{
returnname;
publicintgetAge（）{
returnage;
publicdoublegetWeight（）{
returnweight;
publicdoublegetHeight（）{
returnheight;
10.3
publicclassExercise10_03{
MyIntegern1=newMyInteger（5）;
n1iseven?
+n1.isEven（））;
n1isprime?
+n1.isPrime（））;
15isprime?
+MyInteger.isPrime（15））;
char[]chars={'
3'
'
5'
9'
};
System.out.println（MyInteger.parseInt（chars））;
Strings="
3539"
System.out.println（MyInteger.parseInt（s））;
MyIntegern2=newMyInteger（24）;
n2isodd?
+n2.isOdd（））;
45isodd?
+MyInteger.isOdd（45））;
n1isequalton2?
+n1.equals（n2））;
n1isequalto5?
+n1.equals（5））;
classMyInteger{
privateintvalue;
publicintgetValue（）{
returnvalue;
publicMyInteger（intvalue）{
this.value=value;
publicbooleanisPrime（）{
returnisPrime（value）;
publicstaticbooleanisPrime（intnum）{
if（（num==1）||（num==2））{
returntrue;
for（inti=2;
i<
=num/2;
i++）{
if（num%i==0）{
returnfalse;
publicstaticbooleanisPrime（MyIntegero）{
returnisPrime（o.getValue（））;
publicbooleanisEven（）{
returnisEven（value）;
publicbooleanisOdd（）{
returnisOdd（value）;
publicstaticbooleanisEven（intn）{
returnn%2==0;
publicstaticbooleanisOdd（intn）{
returnn%2!
=0;
publicstaticbooleanisEven（MyIntegern）{
returnisEven（n.getValue（））;
publicbooleanequals（intanotherNum）{
returnvalue==anotherNum;
publicbooleanequals（MyIntegero）{
returnvalue==o.getValue（）;
publicstaticintparseInt（char[]numbers）{
//numbersconsistsofdigitcharacters.
//Forexample,ifnumbersis{'
1'
2'
},thereturnvalue
//shouldbe125.Pleasenotethat
//numbers[0]is'
//numbers[1]is'
//numbers[2]is'
intresult=0;
for（inti=0;
numbers.length;
result=result*10+（numbers[i]-'
0'
）;
returnresult;
//YoumaymentionthiswhenyoucoveredCh8
publicstaticintparseInt（Strings）{
//sconsistsofdigitcharacters.
//Forexample,ifsis"
125"
thereturnvalue
//shouldbe125.
s.length（）;
result=result*10+（s.charAt（i）-'
10.4
publicclassExercise10_04{
MyPointp1=newMyPoint（）;
MyPointp2=newMyPoint（10,30.5）;
System.out.println（p1.distance（p2））;
System.out.println（MyPoint.distance（p1,p2））;
classMyPoint{
privatedoublex;
privatedoubley;
publicMyPoint（）{
publicMyPoint（doublex,doubley）{
this.x=x;
this.y=y;
publicdoubledistance（MyPointsecondPoint）{
returndistance（this,secondPoint）;
publicstaticdoubledistance（MyPointp1,MyPointp2）{
returnMath.sqrt（（p1.x-p2.x）*（p1.x-p2.x）+（p1.y-p2.y）
*（p1.y-p2.y））;
publicdoublegetX（）{
returnx;
publicdoublegetY（）{
returny;
10.5
publicclassExercise10_05{
StackOfIntegersstack=newStackOfIntegers
（2）;
java.util.Scannerinput=newjava.util.Scanner（System.in）;
//Prompttheusertoenteraninteger
System.out.print（"
Enteraninteger:
//Convertstringtoint
intnumber=input.nextInt（）;
Thefactorsfor"
+number+"
is"
//Findandstoreallthesmallestfactorsoftheinteger
intfactor=2;
while（factor<
=number）{
if（number%factor==0）{
number=number/factor;
stack.push（factor）;
else{
factor++;
//Displayfactors
while（!
stack.empty（））{
System.out.print（stack.pop（）+"
10.6
publicclassExercise10_06{
finalintLIMIT=120;
intcount=0;
StackOfIntegersstack=newStackOfIntegers（）;
//Repeatedlyfindprimenumbers
for（intnumber=2;
number<
LIMIT;
number++）
if（isPrime（number））{
stack.push（number）;
count++;
//Increasetheprimenumbercount
//Printthefirst30primenumbersindecreasingorder
Theprimenumberslessthan120are\n"
finalintNUMBER_PER_LINE=10;
if（stack.getSize（）%NUMBER_PER_LINE==0）
System.out.println（）;
//advancetothenewline
publicstaticbooleanisPrime（intnumber）{
//Assumethenumberisprime
booleanisPrime=true;
//Exercise03_21ifnumberisprime
for（intdivisor=2;
divisor<
=number/2;
divisor++）{
//Iftrue,thenumberisnotprime
if（number%divisor==0）{
//SetisPrimetofalse,ifthenumberisnotprime
isPrime=false;
break;
//Exittheforloop
returnisPrime;
10.7
publicclassExercise10_07{
//Createtenaccounts
privateAccount[]accounts=newAccount[10];
publicExercise10_07（）{
accounts.length;
accounts[i]=newAccount（）;
accounts[i].setId（i）;
accounts[i].setBalance（100）;
continueATM:
while（true）{
Enteranid:
id=input.nextInt（）;
if（id<
1||id>
10）{
Pleaseenteracorrectid"
continue;
while（true）{
intchoice=getAChoice（）;
switch（choice）{
case1:
Thebalanceis"
accounts[id].getBalance（））;
case2:
withdraw（）;
case3:
deposit（）;
case4:
//Youcanrewritethecodewithoutusingthecontinue.
//Todoso,introduceabooleanvariabletocontrolone
//customersession
continuecontinueATM;
privatestaticjava.util.Scannerinput=newjava.util.Scanner（System.in）;
intid;
newExercise10_07（）;
publicvoidwithdraw（）{
Enteranamounttowithdraw:
intamount=input.nextInt（）;
if（amount<
=accounts[id].getBalance（））{
accounts[id].withdraw（amount）;
Theamountistoolarge,ignored"
publicvoiddeposit（）{
Enteranamounttodeposit:
if（amount>
=0）{
accounts[id].deposit（amount）;
Theamountisnegative,ignored"
publicintgetAChoice（）{
intchoice;
\nMainmenu"
1:
checkbalance"
2:
withdr
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