3、设计四个类,分别是:
(1)Shape表示图形类,有面积属性area、周长属性per,颜色属性color,有两个构造方法(一个是默认的、一个是为颜色赋值的),还有3个抽象方法,分别是:getArea计算面积、getPer计算周长、showAll输出所有信息,还有一个求颜色的方法getColor。
public abstract class Shape {
double area;
double per;
char color;
Shape(){
}
Shape(char color){
this.color = color;
}
public abstract double getArea();
public abstract double getPer();
public abstract void showAll();
public char getColor(){
return color;
}
}
(2)2个子类:
1)Rectangle表示矩形类,增加两个属性,Width表示长度、height表示宽度,重写getPer、getArea和showAll三个方法,另外又增加一个构造方法(一个是默认的、一个是为高度、宽度、颜色赋值的)。
public class Rectangle extends Shape {
double width;
double height;
Rectangle(){
}
Rectangle(double width, double height,char color){
super(color);
this.width = width;
this.height = height;
}
@Override
public double getArea() {
area = width*height;
return area;
}
@Override
public double getPer() {
per = 2*(width+height);
return per;
}
@Override
public void showAll() {
System.out.println("长:"+width);
System.out.println("宽:"+height);
System.out.println("面积:"+getArea());
System.out.println("周长:"+getPer());
System.out.println("颜色:"+getColor());
}
}
2)Circle表示圆类,增加1个属性,radius表示半径,重写getPer、getArea和showAll三个方法,另外又增加两个构造方法(为半径、颜色赋值的)。
public class Circle extends Shape {
final double pi = 3.14;
double radius;
Circle(){
}
Circle(double radius,char color){
super(color);
this.radius = radius;
}
@Override
public double getArea() {
area = pi*radius*radius;
return area;
}
@Override
public double getPer() {
per = 2*pi*radius;
return per;
}
@Override
public void showAll() {
System.out.println("半径:"+radius);
System.out.println("面积:"+getArea());
System.out.println("周长:"+getPer());
System.out.println("颜色:"+getColor());
}
}
(3)一个测试类PolyDemo,在main方法中,声明创建每个子类的对象,并调用2个子类的showAll方法。
public class PolyDemo {
public static void main(String[] args) {
Rectangle r = new Rectangle(1,2,'蓝');
Circle c = new Circle(1.2,'红');
r.showAll();
System.out.println("-----------------");
c.showAll();
System.out.println("-----------------");
}
}
4、Cola公司的雇员分为以下若干类:
(1) ColaEmployee :这是所有员工总的父类,属性:员工的姓名,员工的生日月份。
方法:getSalary(int month) 根据参数月份来确定工资,如果该月员工过生日,则公司会额外奖励100 元。
(2) SalariedEmployee : ColaEmployee 的子类,拿固定工资的员工。
属性:月薪
(3) HourlyEmployee :ColaEmployee 的子类,按小时拿工资的员工,每月工作超出160 小时的部分按照1.5 倍工资发放。
属性:每小时的工资、每月工作的小时数
(4) SalesEmployee :ColaEmployee 的子类,销售人员,工资由月销售额和提成率决定。
属性:月销售额、提成率
(5) 定义一个类Company,在该类中写一个方法,调用该方法可以打印出某月某个员工的工资数额,写一个测试类TestCompany,在main方法,把若干各种类型的员工放在一个ColaEmployee 数组里,并单元出数组中每个员工当月的工资。
public abstract class ColaEmployee {
String name;
int year;
int month;
int day;
ColaEmployee(){
}
ColaEmployee(String name,int year,int month,int day){
this.name = name;
this.day = day;
this.month = month;
this.year = year;
}
abstract double getSalary(int month);
}
public class SalariedEmployee extends ColaEmployee {
double salary;
SalariedEmployee(){
}
SalariedEmployee(String name,int year,int month,int day,double salary){
super(name, year, month, day);
this.salary =salary;
}
@Override
double getSalary(int month) {
if(month == this.month){
salary +=100;
}
return salary;
}
}
public class SalesEmployee extends ColaEmployee{
double monthSalary;
double rate;
SalesEmployee(){
}
public class HourlyEmployee extends ColaEmployee{
double hourSalary;
int hour;
HourlyEmployee(){
}
HourlyEmployee(String name,int year,int month,int day,double hourSalary,int hour){
super(name, year, month, day);
this.hourSalary =hourSalary;
this.hour = hour;
}
@Override
double getSalary(int month) {
double salary = 0;
if(hour<=160){
salary = hour * hourSalary;
}else{
salary = 160 * hourSalary + (hour - 160 )*hourSalary*1.5;
}
if(month == this.month){
salary +=100;
}
return salary;
}
}
SalesEmployee(String name,int year,int month,int day,double monthSalary,double rate){
super(name, year, month, day);
this.monthSalary =monthSalary;
this.rate = rate;
}
@Override
double getSalary(int month) {
double salary=monthSalary * rate;
if(month == this.month){
salary +=100;
}
return salary;
}
}
public class Company {
static void getSalary(int month,ColaEmployee c){
System.out.println(month+"月"+c.name+"的工资:"+c.getSalary(month));
}
}
public class TestCompany {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ColaEmployee[] a = new ColaEmployee[3];
a[0]=new SalariedEmployee("大川",1988,2,29,3500);
a[1]=new HourlyEmployee("海鸥",1988,2,29,20,200);
a[2]=new SalesEmployee("abc",1988,5,10,30000,0.1);
for(ColaEmployee c:a){
Company.getSalary(2, c);
}
}
}