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  • 课后作业

    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);
            }
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/hyonf/p/12970414.html
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