4月21日Java作业

1.

package cheng;
 
public abstract class Shape {
    protected double area;
    protected double  per;
    protected String  color;
    public Shape(){
         
    };
    public Shape(String color) {
        this.color=color;
    }
    public abstract  void a();
    public abstract void c();
    public abstract void showAll();
}

package cheng;
 
public class Rectangle extends Shape{
    private int width;
    private int height;
    public Rectangle() {
    }
    public Rectangle(int width,int height,String color) {
        super();
        this.width=width;
        this.height=height;
        this.color=color;
    }
    public void a() {
        area=width*area;
    }
    public void c() {
        per=(width+height)*2;
    }
    public void showAll() {
        System.out.println("矩形面积为:"+area+"周长为："+per+"颜色为："+color);
    }

package cheng;
 
public class Cola extends Shape {
    private double radius;
    public Cola(double radius,String color) {
        this.radius=radius;
        this.color=color;
    }
    public Cola() {
        // TODO 自动生成的构造函数存根
    }
    public void a() {
        area=radius*radius*3.14;
    }
    public void c() {
        per=radius*2*3.14;
    }
    public void showAll() {
        System.out.println("圆形面积为:"+area+"周长为："+per+"颜色为："+color);
    }
     
 
}

package cheng;
 
public class Test {
 
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        Rectangle rectangle=new Rectangle(3,3,"yellow");  
        Cola cola=new Cola(3,"break");
        cola.a();
        cola.c();
        cola.showAll();
        rectangle.a();
        rectangle.c();
        rectangle.showAll();
 
    }
 
}

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。

Ÿ 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。

Ÿ 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。

Ÿ 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。

Ÿ 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 class mhm {
    String name;
    int month;

    public ColaEmployee() {

    }

    public ColaEmployee(String name,int month){
        this.name=name;
        this.month=month;
    }

    public double getSalary(int month) {
        return 0;
    }

}


public class SalariedEmployee extends mhm{
    double monSalary;//月薪

    public SalariedEmployee(String name,int month,double monSalary) {
        super(name,month);
        this.monSalary=monSalary;
    }
    //    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。
    public double getSalary(int month) {
        if (super.month==month) {
            return monSalary +100;
        }else {
            return monSalary;
        }

    }

}

public class HourlyEmployee extends mhm {
    private int hourSalary;
    private int hourNum;

    public HourlyEmployee(String name, int month,int hourSalary,int hourNum) {
        super(name,month);
        this.hourSalary=hourSalary;
        this.hourNum=hourNum;
    }

    public double getSalary(int month) {
        if(super.month==month) {
            if (hourNum>160) {
                return hourSalary*160+hourSalary*(hourNum-160)*1.5+100;
            }else {
                return hourSalary*hourNum+100;
            }
        }else {
            if (hourNum>160) {
                return hourSalary*160+hourSalary*(hourNum-160)*1.5;
            }else {
                return hourSalary*hourNum;
            }
        }

    }

}

public class SalesEmployee extends mhm{
    private int monthSales;
    private double royaltyRate;

    public SalesEmployee(String name, int month,int monthSales,double royaltyRate) {
        super(name, month);
        this.monthSales = monthSales;
        this.royaltyRate = royaltyRate;
    }
    //    工资=月销售额*提成率
    public double getSalary(int month) {
        if(super.month == month) {
            return monthSales * royaltyRate + 100;
        }else {
            return monthSales * royaltyRate;
        }
    }

}

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");
    }
}

public class Textcompany {
    public static void main(String[] args) {
        ColaEmployee[] cel = {
                new SalariedEmployee("salariedEmployee", 6, 30000),
                new HourlyEmployee("hourlyEmployee", 5, 100, 300),
                new SalesEmployee("salesEmployee", 3, 7000000, 0.3)
        };
        for (int i = 0; i < cel.length; i++) {
            new Company().getSalary(cel[i],7);
        }
    }
}

 

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。

/Fruit接口
public interface Fruit {

}
public class Apple implements Fruit {
    public Apple() {
        System.out.println("创建了一个苹果类的对象");
    }
}
public class Banana implements Fruit {
    public Banana() {
        System.out.println("创建了一个香蕉类的对象");
    }
}
class grape implements Fruit {
    public grape() {
        System.out.println("创建了一个葡萄类的对象");
    }
}

public class Gardener{
    public Fruit create() {
        Scanner input = new Scanner(System.in);
        String name = input.next();
        Fruit fruit = null;
        switch(name){
        case "苹果":
            fruit = new Apple();
            break;
        case "香蕉":
            fruit = new Banana();
            break;
        }
        return fruit;
    }
}


public class FruitText{
    public static void main(String[] args) {
        Gardener g = new Gardener();
        g.create();

    }