、设计三个类,分别如下:(知识点:抽象类及抽象方法)[必做题]
•3.1设计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。
•3.2设计2个子类:
•3.2.1 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)。
•3.2.2 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)。
•3.3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。
package zy; public abstract class Shape { double area; double per; char color; public Shape() { super(); } public Shape(char color) { super(); this.color=color; } public abstract double getPer(); public abstract double getArea(); public abstract void showAll(); public char getColor() { return color; } } package zy; public class Rectangle extends Shape{ double length; double width; public double getPer() { return(length+width)*2; } public double getArea() { return length*width; } public Rectangle() { super(); } public Rectangle(double length,double width,char color) { super(); this.length=length; this.width=width; this.color=color; } public void showAll() { System.out.println("矩形的长是"+length+"宽是"+width+"颜色是"+color+"周长是"+getPer()+"面积是"+getArea()); } }package zy; public class Circle extends Shape{ double radius; public double getPer() { return 3.14*2*radius; } public double getArea() { return 3.14*radius*radius; } public Circle(double radius,char color) { super(); this.radius=radius; this.color=color; } public void showAll() { System.out.println("圆形的半径是"+radius+"颜色是"+color+"周长是"+getPer()+"面积是"+getArea()); } }package zy; public class test { public static void main(String[] args) { Rectangle r=new Rectangle(2,4,'蓝'); r.showAll(); Circle c=new Circle(1,'绿'); c.showAll(); } }
4、Cola公司的雇员分为以下若干类:(知识点:多态)[必做题]
•4.1 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(intmonth)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。
•4.2 SalariedEmployee:ColaEmployee的子类,拿固定工资的员工。属性:月薪
•4.3 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
•4.4SalesEmployee: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
•4.5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。
package zy; public abstract class ColaEmployee { protected String name; protected int month; public ColaEmployee() { super(); } public ColaEmployee(String name, int month) { super(); this.name = name; this.month = month; } public String getName() { return name; public void setName(String name) { this.name = name; } public int getMonth() { return month; } public void setMonth(int month) { this.month = month; } public double getSalary(int month) { return 0; } } package zy; public class SalariedEmployee extends ColaEmployee { private double salary; public SalariedEmployee(double salary) { super(); this.salary = salary; } public SalariedEmployee(String name, int month, double salary) { super(name, month); this.salary = salary; } public double getSalary(int month) { if (super.month == month) { return month + 100; } else { return salary; } } } package zy; public class HourlyEmployee extends ColaEmployee{ protected int hour; protected int hoursalary; public HourlyEmployee() { super(); } public HourlyEmployee(String name, int month, int hour, int hoursalary) { super(name, month); this.hour = hour; this.hoursalary = hoursalary; } public double getSalary(int month) { if (super.month == month) { if (hour > 160) { return hoursalary * 160 + hoursalary * (hour - 160) * 1.5 + 100; } else { return hoursalary * hour + 100; } } else { if (hour > 160) { return hoursalary * 160 + hoursalary * (hour - 160) * 1.5; } else { return hoursalary * hour; } } } } package zy; public class SalesEmployee extends ColaEmployee { protected int yuexiaoshou; protected double tuchenglv; public SalesEmployee() { super(); } public SalesEmployee(String name, int month, int yuexiaoshou, double tuchenglv) { super(name, month); this.yuexiaoshou = yuexiaoshou; this.tuchenglv = tuchenglv; } public double getSalary(int month) { if (super.month == month) { return yuexiaoshou * tuchenglv + 100; } else { return yuexiaoshou * tuchenglv; } } } package zy; public class company { public void getSalary(ColaEmployee c, int month) { System.out.println(c.name + "在" + month + "月的月薪为" + c.getSalary(month) + "元"); } } package zy; public class testCompany { public static void main(String[] args) { // TODO Auto-generated method stub ColaEmployee c1[] = { new SalariedEmployee("a", 300, 20000), new HourlyEmployee("b", 6, 1500, 20),new SalesEmployee("c", 5, 3400, 5) }; for (int i = 0; i < c1.length; i++) { new company().getSalary(c1[i], 5); } } }