java语言程序设计基础篇第十版第十三章练习答案Word下载.docx

java语言程序设计基础篇第十版第十三章练习答案Word下载.docx

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}

}

classTriangleNewextendsGeometricObject{

privatedoubleside1=1.0,side2=1.0,side3=1.0;

/**Constructor*/

publicTriangleNew（）{

publicTriangleNew（doubleside1,doubleside2,doubleside3）{

this.side1=side1;

this.side2=side2;

this.side3=side3;

/**ImplementtheabstractmethodfindAreainGeometricObject*/

publicdoublegetArea（）{

doubles=（side1+side2+side3）/2;

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;

//S（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