编程练习题
（11.2~11.4节）+（11.5~11.14节）
11.1（三角形Triangle）
父类（左边） 和 子类（右边）继承关系，
如下图：
package p11;
public class GeometricObject {
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;
public GeometricObject() {
dateCreated=new java.util.Date();
}
public GeometricObject(String color, boolean filled) {
dateCreated=new java.util.Date();
this.color=color;
this.filled=filled;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color=color;
}
public boolean isFilled() {
return filled;
}
public void setFilled(boolean filled) {
this.filled=filled;
}
public java.util.Date getDateCreated() {
return dateCreated;
}
public String toString() {
return "created on " + dateCreated + "\ncolor: " + color+
" and filled: " + filled;
}
}
package p11;
public class Triangle extends GeometricObject {
private double side1 = 1.0;
private double side2 = 1.0;
private double side3 = 1.0;
public Triangle() {
}
//这是一个 重载 的构造方法
public Triangle(double side1, double side2,
double side3, String color, boolean filled) {
super(color,filled);//或者 调用父类中已有方法 ,如下
//setColor(color);
//setFilled(filled);
this.side1=side1;
this.side2=side2;
this.side3=side3;
}
public double getSide1() {
return side1;
}
public double getSide2() {
return side2;
}
public double getSide3() {
return side3;
}
public double getArea() {
double s=(side1+side2+side3)/2;
double area=Math.pow( s*(s-side1)*(s-side2)*(s-side3) , 0.5);
return area;
}
public double getPerimeter() {
return side1+side2+side3;
}
@Override
public String toString() {
return super.toString() + "\nArea is " + getArea();
}
}
package p11;
import java.util.Scanner;
public class Test1 {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("请输入三角形的三条边：");
double s1=input.nextInt();
double s2=input.nextInt();
double s3=input.nextInt();
System.out.print("请输入三角形的颜色: ");
String c1=input.next();
System.out.print("请输入一个boolean值(false:不填充；true：填充)：");
boolean f1=input.nextBoolean();
input.close();
//创建对象
GeometricObject object=new Triangle(s1, s2, s3, c1, f1);
System.out.println(object.toString());
}
}
（11.5~11.14节）
11.2（Person、Student、Employee、Faculty 和 Staff类）
这个不难，我也就是在 受聘日期 那里“卡壳”了一下
总体的继承关系：
package p11;
public class Person {
private String name;
private String adress;
private String phone;
private String email;
public Person(String name, String adress, String phone, String email) {
this.name=name;
this.adress=adress;
this.phone=phone;
this.email=email;
}
public Person(String name) {
this.name=name;
}
public String getAdress() {
return adress;
}
public void setAdress(String adress) {
this.adress=adress;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone=phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email=email;
}
public String toString() {
return "The Person's name is "+name+"\nAdress is "+adress+
"\nPhone is "+phone+"\nEmail is "+email;
}
}
package p11;
public class Student extends Person {
private int classState;
public final static int FRESHMAN=1;//大一新生
public final static int SOPHOMORE=2;//大二学生
public final static int JUNIOR=3;//大三学生
public final static int SENIOR=4;//大四学生
public Student(int classState, String name, String adress, String phone, String email) {
super(name, adress, phone, email);
this.classState=classState;
}
public int getClassState() {
return classState;
}
public void setClassState(int classState) {
this.classState=classState;
}
@Override
public String toString() {
return "The Student's classState is "+classState+"\n"+super.toString();
}
}
package p11;
import java.util.Date;
import p10.MyDate;
public class Employee extends Person {
private String office;
private double salary;
private MyDate DateOfAppointment;//受聘日期
//构造方法
public Employee(String office, double salary, MyDate DateOfAppointment,
String name, String adress, String phone, String email) {
super(name, adress, phone, email);
this.DateOfAppointment=DateOfAppointment;
this.salary=salary;
this.office=office;
}
public String getOffice() {
return office;
}
public void setOffice(String office) {
this.office=office;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary=salary;
}
public String getDateOfAppointment() {
return DateOfAppointment.getYear()+"年"+DateOfAppointment.getMonth()
+"月"+DateOfAppointment.getDay()+"日";
}
@Override
public String toString() {
return "The Employee's dateOfAppointment is "+ getDateOfAppointment()
+"\nOffice is "+office+"\nSalary is "+salary+"\n"+super.toString();
}
}
package p11;
import p10.MyDate;
public class Faculty extends Employee {
private long officeHours;
private String rank;
//构造方法
public Faculty(long officeHours, String rank, String office, double salary, MyDate DateOfAppointment,
String name, String adress, String phone, String email) {
super(office, salary, DateOfAppoint