java程序设计(辛运帏饶一梅马素霞第二版)课后习题答案

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1、习题2.2import java.util.*;class MyDateprivate int year;private int month;private int day;public MyDate(int y,int m,int d)构造函数，构造方法year=y;month=m;day=d;/end public MyDate(int y,int m,int d)public int get Year。返回年return year;/end getYear()public int getMonth。返回月return month;/end getMonth()public int get

2、Day()返回 I Ireturn day;/end getDayO/end class MyDateclass Employee private String name;private double salary;private MyDate hireDay;public Employee(String n,double s,MyDate d)name=n;salary=s;hireDay=d;/end public Employee(String n,double s,MyDate d)public void print()System.out.println(名字:+name+”n 工资

3、:“+salary+”n 雇佣年份:“+hireYear()+n);/end print()public void raiseSalary(double byPercent)salary*=1 +byPercent/100;/endpublic int hireYear()return hireDay.getYear();)/end class Employeepublic class MyTestClass public static void main(String args)EmployeeJstaff=new Employee3J;staffO=new Employee(nHarry

4、Hacker,35000,new MyDate(1989,10,1);staffl=new Employee(uCarl Carcker,75000,new MyDate(1987,12J5);staff2=new Employee(Tony Tester,38000,new MyDate(1990,3,12);int integerValue;System.out.printlnCThe information of employee are:1);for(integerValue=0;integerValue=2;integerValue+)staffintegerValue.raiseS

5、alary(5);/end for()for(integerValue=0;integerValue=31;System.out.println(,b2=+b2);b2 =1;System.out.println(,b2=H+b2);)习题3.4public class Factorial private int result,initVal;public static int Factorial(int n)if(n=0)return 1;)return n*Factorial(n-l);)public void print()System.out.println(initVal+,!=,+

6、result);)public void setInitVal(int n)initVal=n;)public static void main(String args)Factorial ff=new Factorial();for(int i=0;i=4;i+)ff.setInitVal(2*(i+1);ff.result=Factorial(ff.initVal);ff.print();/end for()/end main()/end public class Factorialpublic class Factorial private int result,initVal;publ

7、ic void print()System.out.println(initVal+!=+result);)public void setInitVal(int n)initVal=n;public static void main(String args)Factorial?ff=new Factorial2();for(int i=0;i=4;i+)ff.setInitVal(2*(i+l);ff.result=I;for(int j=2;j50)count+;if(MINofl 0050)count+;if(MAXofl 00MINofl 00)num=MINofl00;MINofl 0

8、0=MAXof 100;MAXofl 00=num;/end if()for(i=0;iMAXofl00)MAXofl 00=num;)else if(num50)count+;)/end for()System.out.println(nthe max of 100 random integers is+MAXofl00);System.out.printlnCthe min of 100 random integers is+MINofl00);System.out.println(nthe number of random more than50 is n+count);/end mai

9、n()/end public class MathRandomTest习题3.7public class PrintAst public void printAstar()System.out.print(,*H);)public void printSpace()System.out.print(n u);)public static void main(String args)PrintAst pa=new PrintAst();int initNum=13;for(int i=1;i=initNum/2+1;i+)tor(int n=1;n=i;n+)pa.printSpace();pa

10、.printSpaceO;)for(int m=1;m=initNum-2*i+2;m+)pa.printSpace();pa.printAstar();)System.out.println();/end forif(initNum%2=0)for(int i=1;i=initNum/2;i+)pa.printSpace();pa.printSpace();)pa.printSpace();pa.printAstar();pa.printSpace();pa.printAstar();System.out.println();for(int i=initNum/2+2;i=initNum;i

11、+)fbr(int n=1;n=initNum-i+1;n+)pa.printSpace();pa.printSpace();for(int m=1;m=2*i-initNum;m+)pa.printSpace();pa.printAstar();)System.out.println();/end forSystem.out.println();/end main()/end public class PrintAst习题3.8public class PrintTriag public void printAstar()System.oul.print(”*)；)public static

12、 void main(String args)int initLine=10;int initNum=10;PrintTriag pt=new PrintTriagO;for(int i=0;i initLine;i+)for(int j=0;j initNum-i;j+)pt.printAstar();)System.out.println();)/end main()/end public class PrintTriag习 题3.9import java.util.*;public class MultipleTable public void printFormula(int i,in

13、t j,int res)System.out.print(i+u*n+j+,=,+res+H H);public static void main(String args)MultipleTable mt=new MultipleTable();int initNum=9;int res=O;for(int i=1 ;i=initNum;i+)for(intj=l;j=i;j+)res=i*j;mt.printFormula(i,j,res);)System.out.println();/end for/end main()/end public class MultipleTable习题3,

14、10import java.io.*;public class HuiWen boolean isHuiWen(char strf,int n)int net=0;int i,j;for(i=0,j=n-1;i n/2;i+,j-)if(stril=strj)net+;/end if /end forif(net=(int)(n/2)return true;/end ifelse return false;)/end boolean isHuiWen(char str,int n)public static void main(String args)HuiWen hwl=new HuiWen

15、();String pm=,H,;try(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader input=new BuiferedReader(reader);System.out.print(ngive your test string:nu);pm=input.readLine();System.out.println(pm);/end trycatch(lOException e)System.out.print(e);/end catchboolean bw=hw 1 .isHuiWen(pm

16、.toCharArray(),pm.Iength();if(bw=true)System.out.println(是回文)else System.out.println(不 是回文)/end main()/end public class HuiWenimport java.io.*;public class HuiWen2 String reverse(String wl)String w2;charstrl=w l.toCharArrayO;int len=wl.length();charstr2=new charllenj;for(int i=O;ilen;i+)str2i=strl l

17、en-l-ij;)w2=new String(str2);return w2;)public static void main(String args)HuiWen2 hwl=new HuiWen2();String pm=,u,;try(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader input=new BufferedReader(reader);System.out.print(give your test string:nu);pm=input.readLine();/end trycat

18、ch(lOException e)System.out.print(e);/end catchString w2=hw 1 .reverse(pm);if(pareTo(pm)=0)System.out.println(是回文”);else System.out.println(不是回文”);)习题3.11import java.io.*;public class PrimeNumber private int pm;public void setPm(int pm)this.pm=pm;)public boolean isPrime()boolean bl=true;int i=2;for(

19、i=2;i 0&this.y 0&this.z 0)if(this.x+this.y)this.z&(this.x+this.z)this.y&(this.z+this.y)this.x)bl=true;/ebd ifelse bl=false;/end else /end if(this.xO&this.yO&this.zO)return bl;/end boolean isTriangle()double getArea()double s=(this.x+this.y+this.z)/2.0;return(Math.sqrt(s*(s-this.x)*(s this.y)*(s this

20、.z);/end double getArea()public static void main(String args)double s=new double31;try(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader input=new BufferedReader(reader);System.out.print(输入三角形的三边的长度:n”);for(int i=0;i=2;i+)输入三个数si=Double.parseDouble(input.readLine();/end for /e

21、nd trycatch(NumberFormatException e)System.out.printlnCformat error!);/end catchcatch(lOException e)System.out.print(e);/end catchTrigsquare ts=new Trigsquare(s0,sl J,s2);if(ts.isTriangle()=true)Sy stem.out.printin(三角形的面积是+ts.getAreaO);/end ifelse System.out.println(输入的三边不能组成三角形！”)；/end else /end ma

22、in()/end public class Trigsquare习题3.14import java.util.*;import java.io.*;import java.util.Date;import java.text.*;import java.text.DateFormat;import java.text.SimpleDateFormat;i mport java.uti 1 ,GregorianCalendar.*;public class MyCalenderextends GregorianCalendar void showCalender(int month)int da

23、ys=31,28,31,30,31,30,31,31,30,31,30,31);Calendar c=Calendar.getlnstance();int year=c.get(Calendar.YEAR);int date=c.get(Calendar.DATE);c=new GregorianCalendar(year,month-1,date);if(year%4=0&year%100!=Oil year%400=0)&month=2)daysl+;/end ifSystem.out.println(n-calendar:1+year+month+-n);System.out.print

24、ln(n 日 一二三四五六”)；c.set(DATE,1);int first=c.get(Calendar.DAY_OF_WEEK);int i;for(i=1;i first;i+)System.out.print。);四个空格)for(i=1;i=daysmonth-1J;i+)if(i 10)System.out.print(,);)System.out.print(+i);System.out.print(H);if(first+%7=0)System.out.println();)/end forSystem.out.println();/end void showCalender

25、(int month)String getDay(int month,int date)Calendar c=Calendar.getlnstance();int year=c.get(Calendar.YEAR);c=new GregorianCalendar(year,month-1,date);int day=c.get(Calendar.DAY_OF_WEEK);String reday=H;switch(day)case 1:reday=星期日；break;/end case 1case 2:reday=星期一”；break;/end case 2case 3:reday=星期二”；

26、break;/end case 3case 4:reday=星期三”;break;/end case 4case 5:reday=星期四”；break;/end case 5case 6:reday=星期五”;break;/end case 6default:reday=星期六”；/end deault /end switch()return reday;/end String getDay(int month,int date)int diffDate(java.util.Date date IJava.util.Date date2)System.out.print(date 1 .get

27、Year()+)；System.out.print(date 1 .getMonth()+System.out.println(date l.getDayO);System.out.print(date2.getYear()+System.out.print(date2.getMonlh()+System.out.println(date2.getDay();return Math.abs(int)(date 1 .getTime()-date2.getTime()/(24*3600*1000);/end int diffDate()int inputNum()/输入选项号int pm=0;t

28、ry(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader input=new BufferedReader(reader);pm=Integer.parseInt(input.readLine();/end trycatch(NumberFormatException e)System.out.println(e);/end catchcatch(lOException e)System.out.println(e);/end catchreturn pm;/end int inputNum()Str

29、ing inputDate()输入 I I 期String pm=”；try(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader input=new BufferedReader(reader);pm=input.readLine();/end trycatch(lOException e)System.out.println(e);/end catchreturn pm;/end int inputNum()public static void main(String args)MyCalender

30、 me=new MyCalender();int count=1;int mon,date2;boolean flag=true;while(count!=0)System.out.print(请从一下几项选择一个:(l,2,3,0)nH);System.out.print(”1 .显示今年你指定的某个月日历n)；System.out.print(”2.显示指定的某月某日是星期儿n”)；System.out.print(3.计算指定的两天的天数的差n)；System.out.print(0.退出 n);count=mc.inputNum();switch(count)case 1:System

31、.out.print(输入月份(1-12):”)；mon=mc.inputNumO;if(mon 0)System.out.println(mon);mc.showCalender(mon);/end ifelse System.out.println(月份输入有误！”)；)break;/end case 1case 2:System.out.print(输入月份：”)；mon=mc.inputNum();System.out.print(输入日期date2=mc.inputNum();System.out.printIn(mc.getDay(mon,date2);System.out.pri

32、ntln();break;/end case 2case 3:java.util.Date mydatel=new java.util.Date();java.util.Date mydate2=new java.util.Date();java.text.DateFormat myFormatter=new java.text.SimpleDateFormat(Hyyyy-MM-ddn);try(System.out.print(输入 date 1 (格式:year-month-day):)；String dl=mc.inputDate();System.out.print(输入 date2

33、(格式:year-month-day):)；String d2=mc.inputDate();mydatel=myFormatter.parse(d 1);mydate2=myFormatter.parse(d2);/end trycatch(ParseException e)System.out.println(e);/end catchSystem.out.println(以上两个 H 期 相 差 +mc.diffDate(mydate 1,mydate2)+”天)break;/end case 3case 0:System.out.println(退出！);System.exit(O);

34、/end case 0default:break;/end default /end switch /end while /end main()/end public class MyCalender习题3.15import java.io.*;public class Moneycout public static void main(String args)intfval=100,50,20,10,5,2,1;int count;intnum=new int7;int asval=O;System.out.println(”请输入人民币币值(以分计)”)；try(InputStreamRe

35、ader reader=new InputStreamReader(System.in);BufferedReader input=new BufferedReader(reader);asval=Integer.parseInt(input.readLine();/end trycatch(NumberFormatException e)System.out.println(输入有误)catch(IOException e)e.printStackTrace();/end catchif(asval!=0)int reval=asval;for(int i=0;i7;i+)numi=asva

36、l/vali;asval=asval%vali;/end forSystem.out.println(输入的人民币币值是+reval);for(int i=0;i 7;i+)if(numi!=0)System.out.println(vali+”分的个数：+numi);/end if/end for/end if/end main/end public class Moneycout习题4.4import java.util.*;public class ArrayValue public static void main(String args)String al=new String5;f

37、or(int i=0;i5;ali+4-=n);String a2=Stringa5=new String5J;for(int i=0;i5;a5i+=null);for(int i=0;i5;i+)System.out.print(a 1+i+”=+a 1 ij+n ”)；System.out.println();for(int i=0;i5;i+)System.out.print(a2+i+=+a2i+n);)System.out.println();for(int i=0;i5;i+)System.out.print(na5n+i+=+a5i+nn);)System.out.printl

38、nO;/end main()/end public class ArrayValue习题4.7import java.io.*;import java.util.*;import java.lang.*;import java.lang.String;class Word charfl invmap=2,2,2,3；3丁3；4,4,4,5,5,5,6,6,6,7,7,7,8，8 ,8 ，9,9,9,9 ;String wd;String nwd;Word(String s)wd=s;getNum();)void getNum()charJ temp=wd.toCharArrayO;for(in

39、t i=0;i wd.length();i+)tempij=invmapl(int)wd.charAt(i)-97J;String ts=new String(temp);nwd=ts;/end for /end void getNum()/end class Wordclass WordLib 构建字典库LinkedList WordList=new LinkedList();WordLib()void ConstructLib(String WordArray)for(int i=0;i=0)if(iter.hasPrevious()iter.previous();iter.add(tem

40、p);addf=0;break;/end if(iter.hasPrevious()else WordList.addFirst(temp);addf=0;break;/end else /end if(pareTo(temp.nwd)=0)/end while /end else /end for /end void ConstructLib(String口 WordArray)构建字典库结束 /end class WordLibclass ResultList LinkedList result=new LinkedList();void add(Word wd)result.add(wd

41、);/end class ResultList 结果列表public class FindWord static String Five Word=watch，natch，noise,risky，stock;static Stringl FourWord=“work”，“back”，“come，deal，“desk，“book“，“java”，“tool”，“face”;public static void main(String args)boolean flag=true,errflag=false;String s=nn;WordLib wl=new WordLib();wl.Const

42、ructLib(FiveWord);wl.ConstructLib(FourWord);Listiterator iter=wl.WordList.listIterator();try(InputStreamReader reader=new InputStreamReader(System.in);BufferedReader br=new BufferedReader(reader);while(flag)System.out.println(请输入数，输入 exit 退出);s=br.readLine();if(pareToIgnoreCase(,exitn)=0)flag=false;

43、System.exit(O);/end if(pareToIgnoreCase(exitn)=0)for(int i=0;i 1 9*II s.charAt(i)2)errflag=true;System.out.printin(输入的数必须是09之间的数”);break;/end if /end for(int i=O;i 0)break;/end if(pareTo(s)0)/end while(iterator.hasNext()Listiterator relter=re.result.listlterator();if(re.result.isEmptyO&(ierrllag)Sys

44、tem.out.println(没有匹配的单词”);while(!re.result.isEmpty()&relter.hasNextO)Word tm=(Word)relter.next();System.out.println(结果是：+tm.nwd+tm.wd);/end while(!re.result.isEmpty()&reIter.hasNext()errflag=false;/end while(flag)/end trycatch(lOException e)e.printStackTrace();/end catch /end main()/end public class

45、 FindWord习题4.8简单选择排序public class ArraySort public void sortArray(intarr,int len)int k=0;int tmp=0;for(int i=0;ilen-l;i+)k=i;fbr(int j=i+l;jlen;j+)if(arrfjarrk)k=j；/end if(arrjarrk)/for(int j=i+l;jlen;j+)tmp=arri;arri=arrk;arrk=tmp;/end for(int i=0;ilen-l;i+)/end public void sortArray(intarr,int len)

46、public void print(intlarr,int len)for(int i=0;ilen;i+)if(arri10)System.out.print(n);)System.out.print(aiTi+u n);if(i+l)%10=0)System.out.println();)/end for/end public void print(intarr,int len)public static void main(String args)ArraySort as=new ArraySort();int arr=new intl(X);System.out.printCAn随机生

47、成的整数的值如下：n);for(int i=0;i100;i+)arri=(int)(100*Math.random();if(arri10)System.out.print(n);ISystem.out.print(aiTi+u n);if(i+l)%10=0)System.out.println();)/end for(int i=0;i100;i+)排序as.sortArray(arr,100);System.out.print(n拍完序的整数数组的值如下:n);as.print(arr,100);/end main()/end public class ArraySort以下是起泡排序

48、public class ArraySort2 public void sortArray2(intJarr,int len)int tmp=0;for(int i=0;i=i+l;j-)if(arr|jjarrj-l)tmp=arrfj;arrjj=arr|j-lj；arrj-l=tmp;/end if(arr|jJaiTj-l)/for/end for/end public void sortAiTay(intarr,int len)public void print(intarr3nt len)for(int i=0;ilen;i+)if(arri10)System.out.print(

49、,);)System.out.print(arri+U);if(i+l)%10=0)System.out.printlnO;)/end for/end public void print(intarr,int len)public static void main(String args)ArraySort2 as=new ArraySort2();int arr=new int100;System.out.print(n随机生成的整数的值如下：nH);for(int i=0;i100;i+)arri=(int)(100*Math.random();if(arri 10)System.out.

50、print(,n);)System.out.print(aiTli+”)；if(i+1)%10=0)System.out.println();)/end for(int i=0;i100;i+)/排序as.sortArray2(arr,100);System.out.print(”n 拍完序的整数数组的值如F：n);as.print(arr,100);/end main()/end public class ArraySort习题4.9public class ArrayCount public static void main(String args)int arr=new int1000;

51、for(int i=0;i1000;i+)arri=(int)(l 00*Math.random()+1);/end forint arrCount=new int100;for(int i=0;i100;i+)arrCounti=0;)for(int i=0;i1000;i+)arrCountarri-1 +;)System.out.print(整数数组的各值的个数如下：n);for(int i=1 ;i=arrCount.length;i+)if(arrCounti-l!=0)System.out.print(i+”的个数为：n+arrCounti-lJ+nt);)System.out.p

52、rint(n);I/end public static void main(String args)/end public class ArrayCount习题4.10class StudentClass 课程类String classid;int credit;StudentClass(String classid,int credit)this.classid=classid;this.credit=credit;)/end class StudentClassclass Studentinfo 学生信息类String sid;String sname;char sex;float avg

53、score;floatJ score=new floatl3J;StudentInfo(String id,String name,char sex,float si,float s2,float s3)this.sid=id;this.sname=name;this.sex=sex;this.scorelO=si;this.scoref 1=s2;this.score2J=s3;Studentlnfo()StudentInfo(String id,String name,char sex)this.sid=id;this.sname=name;this.sex=sex;/end Studen

54、tInfo(String id,String name,char sex)void print()System.out.println(“学号:”+this.sid+t 名字S+this.sname+nt 性别:”+this.sex);System.out.println(“语文成绩=+this.scorefO+n 数学成绩=+this.scorel+n 自然科学成绩=+this.score2J);System.out.println(平均分:+this.avgscore);System.out.println();/end void print()void print2()System.ou

55、t.println(姓名：n+this.sname+Mt 学号:+this.sid+t 平均分:“+this.avgscore);/end void print2()/end class Studentinfo 学生信息类public class StuScore 课程数组初始化Studentlnfo st;StudentClass sc=new StudentClass3;void initStudentClass()sc0=new StudentClass(语文”,5);scl=new StudentClass(数学”,3);sc2=new StudentClass(H 自然科学”,4);

56、/end public class StuScore 课程数组初始化void initStudentInfo()学生信息数组初始化st=new Studentlnfo5;stO=new Studemlnfo(”20110023001”,“王莹”，女,100,100,100);stl=new Studentlnfo(”20116546045”,”杨子青;男；67,71,80);st=new Sludentlnfo(“20115641452,“王溪”，女,91,93,90);st3=new Studentlnfo(20111421242,57,76,74);st4=new Studentlnfo(

57、“20119751452”,“王夏瑾”，女,76,85,80);/end void initStudentlnfo。学生信息数组初始化void accuScore。计算学分float as=0;int cs=0;for(int i=0;i st.length;i+)for(int j=0;j sc.length;j+)as+=scj.credit*sti.scorej;cs+=scj.credit;/end forsti.avgscore=(float)(as/cs);/end for /end void AccuScore()计算学分void sortScore()学分排序Studentin

58、fo tmp=new Studentlnfo();for(int i=0;i st.length;i+)tor(int j=i+1;j st.length;j+)if(sti.avgscore stfjl.avgscore)tmp=sti;sti=stj;stj=tmp;)/end for /end排序void print。输出学生信息System.out.println(,-)；System.out.println(学生信息如 F：);System.out.println(,-);for(int i=0;i st.length;i+)sti.print();/end for /end voi

59、d print()void print2()输出排名信息System.out.println(H-)；System.out.println(学生成绩排名信息如下:);System.out.println(H-)；for(int i=0;i st.length;i+)stij.print2();/end for /end void print2()public static void main(String args)StuScore stc=new StuScore();stc.inilStudentClass();stc.initStudentInfo();stc.accuScore();s

60、tc.print();stc.sortScore();stc.print2();/endpublic static void main(String args)/end public class StuScore习题4.11import java.*;import java.io.*;import java.util.Vector;class CD /cd 类String cdid;String cdname;float price;String press;CD()无参数的构造方法 /end CD()CD(String cdid,String cdname,float price,Strin

61、g press)构造方法this.cdid=cdid;this.cdname=cdname;this.price=price;this.press=press;/end CD(String cdid,String cdname,float price,String press)void setID(String cdid)this.cdid=cdid;/end void setID(String cdid)void setName(String cdname)this.cdname=cdname;/end void setName()void setPrice(float price)this

62、.price=price;/end void setPrice()void setPress(String press)this.press=press;/end void setPres()void print()输出cd 的相关信息System.out.println(ID 编号:“+this.cdid+nt+Name 名字:“+this.cdname+Ht+Price 价格:+this.price+ntn+Press 发行公司:“+this.press);/end void print()/end class CDpublic class CDManagerextends Vector

63、Vector cds;CDManager()cds=new Vector(50,1);/end CDManager()int addCD(CD tmpcd)cds.addElement(tmpcd);return 1;/end int addCD(CD tmpcd)int deleteCD()if(cds.isEmptyO=false)int i=cds.size();cds.removeElementAt(i-1);retum I;)else return 0;)/end int deleteCD()CD findCD(String cdid)按编号查找CD tmpcd=new CD();i

64、nt i=0;for(i=0;i 0)System.out.println(nnumber of vector elements is +length+and they are:);for(int i=0;i 0)System.out.println(添加成功！”)；/end ifelse System.out.printin(添加失败!);/end elsebreak;/end case 1case 2:Syslem.oul.prinl(请输入你想要查找的c d 的编号ID：*);String id=cm.inputStr();CD fcd=cm.findCD(id);if(fcd.cdid

65、=null)System.out.printing没有你想要的 cd”);/end if(fcd.cdid=null)elseSystem.out.println(你查找的cd的信息如下：”);fcd.print();/end elsebreak;/endcase 2case 3:/删除 cdif(cm.deleteCD()0)System.out.println(删除成功)；/end ifelseSystem.out.println(删 除失败”);/end elsebreak;/endcase 3case 4:cm.prinlCDO;break;/endcase 4case 0:Syste

66、m.exit(O);/endcase 0default:1break;/end default /end switch /end while(count!=0)/end public static void main(StringJ args)/end public class CDManager extends Vector习 题5.2import java.util.*;class ParentClass public ParentClass()value=0;public int getValue()return value;)public void setValue(int y)value=y;private int value;/end class ParentClassclass SubClass 1extends ParentClass public SubClass 1()value=1;)public int getValue()return value;)public int getClassValuel()return classvalue 1;)private