标签：getc 动态 url 抽象方法 mon ceo equal 技术 宽度
1.设计四个类，分别是：（知识点：抽象类及抽象方法）
（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。
private double area;
private double per;
private String color;
public Shape() {
}
public Shape(String color) {
this.color = color;
}
public abstract double getArea();
public abstract double getPer();
public abstract void showAll();
public void getColor() {
System.out.println("颜色："+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）。
private double width;
private double height;
private String color;
public Rectangless() {
}
public Rectangless(double width , double height , String color) {
super(color);
this.width = width;
this.height =height;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return width*height;
}
@Override
public double getPer() {
// TODO Auto-generated method stub
return 2*(width+height);
}
@Override
public void showAll() {
// TODO Auto-generated method stub
System.out.println("Rectangle:"+"长度为："+height+",宽度为："+width+",周长为："+getPer()+",面积为："+getArea());
}
}
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）。
private double radius;
private String color;
public Circle(String color) {
super(color);
}
public Circle(double radius) {
this.radius = radius;
}
@Override
public double getArea() {
// TODO Auto-generated method stub
return 3.14*(radius*radius);
}
@Override
public double getPer() {
// TODO Auto-generated method stub
return 3.14*(2*radius);
}
@Override
public void showAll() {
// TODO Auto-generated method stub
System.out.println("Circle:"+"半径为："+radius+",周长为："+getPer()+",面积为："+getArea());
}
（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。
Rectangless R = new Rectangless(5 , 4 ,"black");
R.showAll();
R.getColor();
System.out.println("==========================");
Circle C = new Circle(3);
Circle C1 = new Circle("red");
C.showAll();
C1.getColor();
2.Cola公司的雇员分为以下若干类：(知识点：多态)
(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。
private String name;
private int birmonth;
public void getSalary(int month) {
System.out.println("month:"+month);
}
(2) SalariedEmployee ： ColaEmployee 的子类，拿固定工资的员工。
? 属性：月薪
private double monthsalary;
private int month;
public void salarySalariedEmployee(String name, int workmonth, int birmonth, double monthsalary) {
if (workmonth == birmonth) {
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + (monthsalary * workmonth + 100));
} else {
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + monthsalary * workmonth);
}
}
(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
private double hoursalary;
private int monthhour;
public void salaryHourlyEmployee(String name, int birmonth, int workmonth, double hoursalary, int monthhour) {
if (monthhour > 160) {
if (workmonth == birmonth) {
double sumsalary = (monthhour * workmonth - 160) * hoursalary * 1.5 + 160 * hoursalary + 100;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
} else {
double sumsalary = (monthhour * workmonth - 160) * hoursalary * 1.5 + 160 * hoursalary;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
}
} else {
if (workmonth == birmonth) {
double sumsalary = monthhour * workmonth * hoursalary + 100;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
} else {
double sumsalary = monthhour * workmonth * hoursalary;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
}
}
}
(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
private double monthsale;
private double rate;
public void salarySalesEmployee(String name, int birmonth, int workmonth, double monthsale, double rate) {
if (workmonth == birmonth) {
double sumsalary = (monthsale * workmonth) * rate + 100;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
} else {
double sumsalary = (monthsale * workmonth) * rate;
System.out.println("name:" + name + ",birmonth:" + birmonth + ",sumSalary:" + sumsalary);
}
}
(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 static void show(ColaEmployee ce) {
if (ce instanceof SalariedEmployee) {
SalariedEmployee se = (SalariedEmployee) ce;
se.salarySalariedEmployee("张三", 6, 6, 6700);
} else if (ce instanceof HourlyEmployee) {
HourlyEmployee he = (HourlyEmployee) ce;
he.salaryHourlyEmployee("李四", 5, 6, 15, 180);
} else if (ce instanceof SalesEmployee) {
SalesEmployee see = (SalesEmployee) ce;
see.salarySalesEmployee("王五", 7, 5, 5200, 0.5);
}
}
package homework;
public class TestCompany {
public static void main(String[] args) {
// TODO Auto-generated method stub
Company C = new Company();
SalariedEmployee se = new SalariedEmployee();
C.show(se);
System.out.println("======================================");
HourlyEmployee he = new HourlyEmployee();
C.show(he);
System.out.println("======================================");
SalesEmployee see = new SalesEmployee();
C.show(see);
}
}
3.
3、利用接口实现动态的创建对象：（知识点：接口 ）
（1）创建4个类
1苹果
2香蕉
3葡萄
4园丁
（2）在三种水果的构造方法中打印一句话.
以苹果类为例
class apple
{
public apple()
{
System.out.println(“创建了一个苹果类的对象”);
}
}
（3）类图如下：
（4）要求从控制台输入一个字符串，根据字符串的值来判断创建三种水果中哪个类的对象。
package homework;
public class Apple implements Fruit{
public Apple() {
System.out.println("创建了一个苹果类的对象");
}
}
package homework;
public class Banana implements Fruit{
public Banana() {
System.out.println("创建了一个香蕉类的对象");
}
}
package homework;
public class Grape implements Fruit{
public Grape() {
System.out.println("创建了一个葡萄类的对象");
}
}
package homework;
import java.util.Scanner;
public interface Fruit {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入水果名字：");
String fruitName = sc.next();
if(fruitName.equals("苹果")) {
new Apple();
}else if(fruitName.equals("香蕉")) {
new Banana();
}else if(fruitName.equals("葡萄")) {
new Grape();
}else {
System.out.println("抱歉！ 暂无此类水果····");
}
}
}
标签：getc 动态 url 抽象方法 mon ceo equal 技术 宽度
原文地址：https://www.cnblogs.com/lilbetter03/p/12929513.html
