、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);
}
}
}