java语言程序设计基础篇第十版第十三章练习答案Word文件下载.docx
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returnMath.sqrt（s*（s-side1）*（s-side2）*（s-side3））;
/**ImplementtheabstractmethodfindCircumferencein
*GeometricObject
**/
publicdoublegetPerimeter（）{
returnside1+side2+side3;
@Override
publicStringtoString（）{
//Implementittoreturnthethreesides
return"
TriangleNew:
side1="
+side1+"
side2="
+side2+
"
side3="
+side3;
02
importjava.util.ArrayList;
publicclassExercise13_02{
ArrayList<
Number>
list=newArrayList<
（）;
list.add（14）;
list.add（24）;
list.add（4）;
list.add（42）;
list.add（5）;
shuffle（list）;
for（inti=0;
i<
list.size（）;
i++）
System.out.print（list.get（i）+"
publicstaticvoidshuffle（ArrayList<
list）{
list.size（）-1;
i++）{
intindex=（int）（Math.random（）*list.size（））;
Numbertemp=list.get（i）;
list.set（i,list.get（index））;
list.set（index,temp）;
03
publicclassExercise13_03{
sort（list）;
publicstaticvoidsort（ArrayList<
//Findtheminimuminthelist[i..list.length-1]
NumbercurrentMin=list.get（i）;
intcurrentMinIndex=i;
for（intj=i+1;
j<
j++）{
if（currentMin.doubleValue（）>
list.get（j）.doubleValue（））{
currentMin=list.get（j）;
currentMinIndex=j;
//Swaplist.get（i）withlist.get（currentMinIndex）ifnecessary;
if（currentMinIndex!
=i）{
list.set（currentMinIndex,list.get（i））;
list.set（i,currentMin）;
04
importjava.util.*;
publicclassExercise13_04{
staticMyCalendarcalendar=newMyCalendar（）;
intmonth=calendar.get（MyCalendar.MONTH）+1;
intyear=calendar.get（MyCalendar.YEAR）;
if（args.length>
2）
UsagejavaExercise13_04monthyear"
elseif（args.length==2）{
//useuser-definedmonthandyear
year=Integer.parseInt（args[1]）;
month=Integer.parseInt（args[0]）;
calendar.set（Calendar.YEAR,year）;
calendar.set（Calendar.MONTH,month-1）;
elseif（args.length==1）{
//useuser-definedmonthforthecurrentyear
calendar.set（Calendar.MONTH,month-1）;
//setdatetothefirstdayinamonth
calendar.set（Calendar.DATE,1）;
//printcalendarforthemonth
printMonth（year,month）;
staticvoidprintMonth（intyear,intmonth）{
//getstartdayoftheweekforthefirstdateinthemonth
intstartDay=getStartDay（）;
//getnumberofdaysinthemonth
intnumOfDaysInMonth=calendar.daysInMonth（）;
//printheadings
printMonthTitle（year,month）;
//printbody
printMonthBody（startDay,numOfDaysInMonth）;
staticintgetStartDay（）{
returncalendar.get（Calendar.DAY_OF_WEEK）;
staticvoidprintMonthBody（intstartDay,intnumOfDaysInMonth）{
//printpaddingspacebeforethefirstdayofthemonth
inti=0;
for（i=0;
startDay-1;
i++）
System.out.print（"
for（i=1;
=numOfDaysInMonth;
if（i<
10）
+i）;
else
if（（i+startDay-1）%7==0）
System.out.println（）;
"
staticvoidprintMonthTitle（intyear,intmonth）{
+calendar.getMonthName（）+"
"
+year）;
-----------------------------"
SunMonTueWedThuFriSat"
05
publicclassExercise13_05{
//Mainmethod
//Createtwocomparablecircles
Circle1circle1=newCircle1（5）;
Circle1circle2=newCircle1（4）;
//Displaythemaxcircle
Circle1circle=（Circle1）GeometricObject1.max（circle1,circle2）;
Themaxcircle'
sradiusis"
+circle.getRadius（））;
System.out.println（circle）;
abstractclassGeometricObject1implementsComparable<
GeometricObject1>
{
protectedStringcolor;
protecteddoubleweight;
//Defaultconstruct
protectedGeometricObject1（）{
color="
white"
;
weight=1.0;
//Constructageometricobject
protectedGeometricObject1（Stringcolor,doubleweight）{
this.color=color;
this.weight=weight;
//Gettermethodforcolor
publicStringgetColor（）{
returncolor;
//Settermethodforcolor
publicvoidsetColor（Stringcolor）{
//Gettermethodforweight
publicdoublegetWeight（）{
returnweight;
//Settermethodforweight
publicvoidsetWeight（doubleweight）{
//Abstractmethod
publicabstractdoublegetArea（）;
publicabstractdoublegetPerimeter（）;
publicintcompareTo（GeometricObject1o）{
if（getArea（）<
o.getArea（））
return-1;
elseif（getArea（）==o.getArea（））
return0;
return1;
publicstaticGeometricObject1max（GeometricObject1o1,GeometricObject1o2）{
if（pareTo（o2）>
0）
returno1;
returno2;
//Circle.java:
ThecircleclassthatextendsGeometricObject
classCircle1extendsGeometricObject1{
protecteddoubleradius;
//Defaultconstructor
publicCircle1（）{
this（1.0,"
1.0）;
//Constructcirclewithspecifiedradius
publicCircle1（doubleradius）{
super（"
this.radius=radius;
//Constructacirclewithspecifiedradius,weight,andcolor
publicCircle1（doubleradius,Stringcolor,doubleweight）{
super（color,weight）;
//Gettermethodforradius
publicdoublegetRadius（）{
returnradius;
//Settermethodforradius
publicvoidsetRadius（doubleradius）{
//ImplementthefindAreamethoddefinedinGeometricObject
returnradius*radius*Math.PI;
//ImplementthefindPerimetermethoddefinedinGeometricObject
return2*radius*Math.PI;
//Overridetheequals（）methoddefinedintheObjectclass
publicbooleanequals（Circle1circle）{
returnthis.radius==circle.getRadius（）;
[Circle]radius="
+radius;
if（getRadius（）>
（（Circle1）o）.getRadius（））
elseif（getRadius（）<
06
publicclassExercise13_06{
//Createtwocomarablerectangles
ComparableCirclecircle1=newComparableCircle（5）;
ComparableCirclecircle2=newComparableCircle（15）;
//Displaythemaxrect
ComparableCirclecircle3=（ComparableCircle）Max.max（circle1,circle2）;
+circle3.getRadius（））;
System.out.println（circle3）;
classComparableCircleextendsCircleimplementsComparable<
ComparableCircle>
/**ConstructaComparableRectanglewithspecifiedproperties*/
publicComparableCircle（doubleradius）{
super（radius）;
publicintcompareTo（ComparableCircleo）{
o.getRadius（））
//Max.java:
Findamaximumobject
classMax{
/**Returnthemaximumoftwoobjects*/
publicstaticComparableCirclemax
（ComparableCircleo1,ComparableCircleo2）{
07
publicclassExercise13_07{
GeometricObject[]objects={newSquare
（2）,newCircle（5）,newSquare（5）,newRectangle（3,4）,newSquare（4.5）};
objects.length;
Areais"
+objects[i].getArea（））;
if（objects[i]instanceofColorable）
（（Colorable）objects[i]）.howToColor（）;
interfaceColorable{
voidhowToColor（）;
classSquareextendsGeometricObjectimplementsColorable{
privatedoubleside;
publicSquare（doubleside）{
this.side=side;
publicvoidhowToColor（）{
Colorallfoursides"
returnside*side;
return4*side;
08
publicclassExercise13_08{
MyStack1stack=newMyStack1（）;
stack.push（"
S1"
S2"
S"
MyStack1stack2=（MyStack1）（stack.clone（））;
stack2.push（"
System.out.println（stack.getSize（））;
System.out.println（stack2.getSize（））;
classMyStack1implementsCloneable{
privateArrayList<
Object>
Objec
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