java第十二周上机练习05/21
Posted lilbetter03
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了java第十二周上机练习05/21相关的知识,希望对你有一定的参考价值。
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····"); } } }
以上是关于java第十二周上机练习05/21的主要内容,如果未能解决你的问题,请参考以下文章