java程序设计(辛运帏第二版)课后习题答案.doc

/习题2.2import java.util.*;class MyDate private 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 getYear()/返回年 return year; /end getYear() public int getMonth()/返回月 return month; /end getMonth() public int getDay()/返回日 return day; /end getDay() /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:+salary+n雇佣年份:+hireYear()+n); /end print() public void raiseSalary(double byPercent) salary*=1+byPercent/100; /end public int hireYear() return hireDay.getYear(); /end class Employeepublic class MyTestClass public static void main(String args) Employeestaff=new Employee3; staff0=new Employee(Harry Hacker,35000,new MyDate(1989,10,1); staff1=new Employee(Carl Carcker,75000,new MyDate(1987,12,15); staff2=new Employee(Tony Tester,38000,new MyDate(1990,3,12); int integerValue; System.out.println(The information of employee are:); for(integerValue=0;integerValue=2;integerValue+) staffintegerValue.raiseSalary(5); /end for() for(integerValue=0;integerValue=2;integerValue+) staffintegerValue.print(); /end for() /end main()/end class MyTestClass/习题2.4import java.util.*;public class DataType public static void main(String args) boolean flag; char yesChar; byte finByte; int intValue; long longValue; short shortValue; float floatValue; double doubleValue; flag=true; yesChar=y; finByte=30; intValue=-7000; longValue=200l; shortValue=20000; floatValue=9.997E-5f; doubleValue=floatValue*floatValue; System.out.println(the values are:); System.out.println(布尔类型变量flag=+flag); System.out.println(字符型变量yesChar=+yesChar); System.out.println(字节型变量finByte=+finByte); System.out.println(整型变量intValue=+intValue); System.out.println(长整型变量longValue=+longValue); System.out.println(短整型变量shortValue=+shortValue); System.out.println(浮点型变量floatValue=+floatValue); System.out.println(双精度浮点型变量doubleValue=+doubleValue); /end main()/习题2.9import java.util.*;class PubTest1 private int ivar1; private float fvar1,fvar2; public PubTest1() fvar2=0.0f; public float sum_f_I() fvar2=fvar1+ivar1; return fvar2; public void print() System.out.println(fvar2=+fvar2); public void setIvar1(int ivalue) ivar1=ivalue; public void setFvar1(float ivalue) fvar1=ivalue; public class PubMainTest public static void main(String args) PubTest1 pubt1=new PubTest1(); pubt1.setIvar1(10); pubt1.setFvar1(100.02f); pubt1.sum_f_I(); pubt1.print(); /习题2.10import java.util.*;class Date private int year; private int month; private int day; public Date(int day, int month, int year) /构造函数，构造方法 this.year = year; this.month = month; this.day = day; /end public MyDate(int y,int m,int d) public int getYear() /返回年 return year; /end getYear() public int getMonth() /返回月 return month; /end getMonth() public int getDay() /返回日 return day; /end getDay() /end class Datepublic class Teacher String name;/教师名字 boolean sex;/性别，true表示男性 Date birth;/出生日期 String salaryID;/工资号 String depart;/教师所在系所 String posit;/教师职称 String getName() return name; void setName(String name) = name; boolean getSex() return sex; void setSex(boolean sex) this.sex = sex; Date getBirth() return birth; void setBirth(Date birth) this.birth = birth; String getSalaryID() return salaryID; void setSalaryID(String salaryID) this.salaryID = salaryID; String getDepart() return depart; void setDepart(String depart) this.depart = depart; String getPosit() return posit; void setPosit(String posit) this.posit = posit; public Teacher() System.out.println(父类无参数的构造方法！); /如果这里不加上这个无参数的构造方法将会出错！ public Teacher(String name,boolean sex,Date birth, String salaryid,String depart,String posit) =name; this.sex=sex; this.birth=birth; this.salaryID=salaryid; this.depart=depart; this.posit=posit; /end Teacher() public void print() System.out.print(the teachername:); System.out.println(this.getName(); System.out.print(the teachersex:); if(this.getSex()=false) System.out.println(女); else System.out.println(男); System.out.print(the teacherbirth:); System.out.println(this.getBirth().getYear()+-+ this.getBirth().getMonth()+-+ this.getBirth().getDay(); System.out.print(the teachersalaryid:); System.out.println(this.getSalaryID(); System.out.print(the teacherposit:); System.out.println(this.getPosit(); System.out.print(the teacherdepart:); System.out.println(this.getDepart(); /end print() public static void main(String args) Date dt1=new Date(11,23,1989); Date dt2=new Date(2,6,1975); Date dt3=new Date(11,8,1964); Date dt4=new Date(10,4,1975); Date dt5=new Date(8,9,1969); /创建各系教师实例，用来测试 Teacher t1=new Teacher(王莹,false,dt1,123,经济学,prefessor); ResearchTeacher rt=new ResearchTeacher(杨zi青,true,dt2,421,软件工程, associate prefessor,software); LabTeacher lat=new LabTeacher(王夏瑾,false,dt3,163,外语, pinstrucor,speech lab); LibTeacher lit=new LibTeacher(马二孩,true,dt4,521,大学物理, prefessor,physicalLib); AdminTeacher at=new AdminTeacher(王xi,false,dt5,663,环境, prefessor,dean); /分别调用各自的输出方法，输出相应信息/ System.out.println(-); t1.print();/普通教师信息 System.out.println(-); rt.print();/研究系列教师信息 System.out.println(-); lat.print();/普通教师信息 System.out.println(-); lit.print();/实验系列教师信息 System.out.println(-); at.print();/行政系列教师信息 System.out.println(-); /end main()/end public class Teacherclass ResearchTeacher extends Teacher private String resField; public ResearchTeacher(String name, boolean sex, Date birth, String salaryid, String depart, String posit, String resField) = name; this.sex = sex; this.birth = birth; this.salaryID = salaryid; this.depart = depart; this.posit = posit; this.resField = resField; /end public ResearchTeacher() String getResField() return resField; void setResField(String resField) this.resField=resField; public void print() System.out.print(research teacher info is:); System.out.print(the teachername:); System.out.println(this.getName(); System.out.print(the teachersex:); if (this.getSex() = false) System.out.println(女); else System.out.println(男); System.out.print(the teacherbirth:); System.out.println(this.getBirth().getYear() + - + this.getBirth().getMonth() + - + this.getBirth().getDay(); System.out.print(the teachersalaryid:); System.out.println(this.getSalaryID(); System.out.print(the teacherposit:); System.out.println(this.getPosit(); System.out.print(the teacherdepart:); System.out.println(this.getDepart(); System.out.print(the teacherresField:); System.out.println(this.getResField(); /end print()/end class ResearchTeacherclass LabTeacher extends Teacher private String labName; public LabTeacher(String name, boolean sex, Date birth, String salaryid, String depart, String posit, String labName) = name; this.sex = sex; this.birth = birth; this.salaryID = salaryid; this.depart = depart; this.posit = posit; this.labName = labName; /end public ResearchTeacher() String getLabName() return labName; void setLabName(String labName) this.labName=labName; public void print() System.out.print(lab teacher info is:); System.out.print(the teachername:); System.out.println(this.getName(); System.out.print(the teachersex:); if (this.getSex() = false) System.out.println(女); else System.out.println(男); System.out.print(the teacherbirth:); System.out.println(this.getBirth().getYear() + - + this.getBirth().getMonth() + - + this.getBirth().getDay(); System.out.print(the teachersalaryid:); System.out.println(this.getSalaryID(); System.out.print(the teacherposit:); System.out.println(this.getPosit(); System.out.print(the teacherdepart:); System.out.println(this.getDepart(); System.out.print(the teacherlabName:); System.out.println(this.labName); /end print()/end class LabTeacherclass LibTeacher extends Teacher private String libName; public LibTeacher(String name,boolean sex,Date birth, String salaryid,String depart, String posit,String libName) = name; this.sex = sex; this.birth = birth; this.salaryID = salaryid; this.depart = depart; this.posit = posit; this.libName=libName; /end public ResearchTeacher() String getLibName() return libName; void setLibName(String libName) this.libName=libName; public void print() System.out.print(lib teacher info is:); System.out.print(the teachername:); System.out.println(this.getName(); System.out.print(the teachersex:); if (this.getSex() = false) System.out.println(女); else System.out.println(男); System.out.print(the teacherbirth:); System.out.println(this.getBirth().getYear() + - + this.getBirth().getMonth() + - + this.getBirth().getDay(); System.out.print(the teachersalaryid:); System.out.println(this.getSalaryID(); System.out.print(the teacherposit:); System.out.println(this.getPosit(); System.out.print(the teacherdepart:); System.out.println(this.getDepart(); System.out.print(the teacherlibName:); System.out.println(this.libName); /end print()/end class LibTeacherclass AdminTeacher extends Teacher private String managePos; public AdminTeacher(String name,boolean sex,Date birth, String salaryid,String depart, String posit,String managePos) = name; this.sex = sex; this.birth = birth; this.salaryID = salaryid; this.depart = depart; this.posit = posit; this.managePos=managePos; /end public ResearchTeacher() String getManagePos() return managePos; void setManagePos(String managePos) this.managePos=managePos; public void print() System.out.print(adminteacher info is:); System.out.print(the teachername:); System.out.println(this.getName(); System.out.print(the teachersex:); if (this.getSex() = false) System.out.println(女); else System.out.println(男); System.out.print(the teacherbirth:); System.out.println(this.getBirth().getYear() + - + this.getBirth().getMonth() + - + this.getBirth().getDay(); System.out.print(the teachersalaryid:); System.out.println(this.getSalaryID(); System.out.print(the teacherposit:); System.out.println(this.getPosit(); System.out.print(the teacherdepart:); System.out.println(this.getDepart(); System.out.print(the teachermanagePos:); System.out.println(this.managePos); /end print()/end class AdminTeacher习题2.11public class Course private String courseID; private String courseName; private String courseType; private int classHour; private float credit; public Course(String courseID, String courseName, String courseType, int classHour, float credit) this.courseID=courseID; this.courseName=courseName; this.courseType=courseType; this.classHour=classHour; this.credit=credit; /end public Course() String getID() return courseID; void setID(String id) this.courseID = id; String getName() return courseName; void setName(String name) this.courseName = name; String getType() return courseType; void setType(String type) this.courseType = type; int getClassHour() return classHour; void setClassHour(int hour) this.classHour = hour; float getCredit() return classHour; void setCredit(float credit) this.credit= credit; public void print() System.out.println(the basic info of this course as followed:); System.out.println(courseID=+this.getID(); System.out.println(courseName=+this.getName(); System.out.println(courseType=+this.getType(); System.out.println(classHour=+this.getClassHour(); System.out.println(credit=+this.getCredit(); public static void main(String args) Course cs=new Course(d12,java程序设计(第二版),cs,64,3.0f); System.out.println(-); cs.print(); System.out.println(修改课程学分为4.0f); cs.setCredit(4); cs.print(); /习题2.12public class MyGraphic String lineColor; String fillColor; MyGraphic(String lc,String fc) this.lineColor=lc; this.fillColor=fc; void print() System.out.println(line color is +this.lineColor+ t fill color is +this.fillColor); public static void main(String args) float rd=(float)4.5; MyCircle mc=new MyCircle(rd,black,white); MyRectangle mr=new MyRectangle(4,6,red,blue); System.out.println(Circle info ); mc.print(); System.out.println(circumference is + mc.calCircum(); System.out.println(square is + mc.calSquare(); System.out.println(rectangle info: ); mr.print(); System.out.println(circumference is + mr.calCircum(); System.out.println(square is + mr.calSquare(); /end main()/end public class MyGraphicclass MyRectangle extends MyGraphic float rLong; float rWidth; MyRectangle (float rl,float rw,String lc,String fc) super(lc,fc); this.rLong=rl; this.rWidth=rw; /end MyRectangle () float calCircum() return (float)(this.rLong+this.rWidth)*2); float calSquare() return (float)(this.rLong*this.rWidth); /end class MyRectangleclass MyCircle extends MyGraphic float radius; MyCircle (float rd,String lc,String fc) super(lc,fc); this.radius=rd; /end MyRectangle () float calCircum() return (float)(this.radius*3.12*2); float calSquare() return (float)(this.radius*this.radius*3.14); /end class MyCircle/习题2.13public class Vehicle String brand; String color; int price; int number; public Vehicle(String b, String c) this.brand = b; this.color = c; public Vehicle(String b, String c, int p, int n) this(b, c); this.price = p; this.number = n; void print() System.out.println(n-); System.out.println(the vehicle info as followed :); System.out.println(brand= + this.brand + t); System.out.println(color= + this.color + t); System.out.println(price= + this.price + t); System.out.println(number= + this.number + t); /end void print() public static void main(String args) Vehicle c1=new Vehicle(vehicle1,white); Vehicle c2=new Vehicle(vehicle2,white,300,1); Car cr=new Car(car1,red,300,4,400); Truck tk2=new Truck(truck1,black,300,400); c1.print(); c2.print(); cr.print(); tk2.print(); /end main() /end public class Vehicleclass Car extends Vehicle int speed; Car(String b, String c, int p, int n,int s) super(b,c,p,n); this.speed=s; void print() super.print(); System.out.print