面向对象求3辆车的平均值

自己练习

package com.fqs.demo1;

import java.util.Scanner;

public class CarTest2 {
    public static void main(String[]args) {
        //1.定义一个数组arr存放3个车
        Car []arr=new Car[3];
        //2.从键盘获取数据
        Scanner sc=new Scanner(System.in);
        //3.循环获取值放到数组中
        for(int i=0;i<arr.length;i++) {
            //初始化对象
            Car c=new Car();
            //3.1提示输入品牌
            System.out.println("请输入品牌");
            String brand=sc.next();
            
            //3.1.1将品牌传入对象c的品牌中
            c.setBrand(brand);
            //3.2提示输入价格
            System.out.println("请输入价格");
            Double price=sc.nextDouble();
            //3.2.1将价格传给c的价格中
            c.setPrice(price);
            //3.3提示输入颜色
            System.out.println("请输入颜色");
            String color=sc.next();
            //3.3.1将颜色传到c的颜色中
            c.setColor(color);
            //将c 放到数组arr中
            arr[i]=c;
        }
        //4.输出数组内的值
        Double sum=1.00;
        for(int i=0;i<arr.length;i++) {
            Car c=arr[i];
            System.out.println(c.getBrand()+" "+c.getPrice()+" "+c.getColor());
            //5.求3辆车的总和
            sum=+c.getPrice();
        }
        //6.平均值
        System.out.println("avg:"+sum/3);
        
    }

}

 学习后

package com.fqs.demo1;

public class CarTest {
    public static void main(String[]args) {
        //1.数组arr存放3个汽车Car arr[]=new Car[3]
        Car []arr=new Car[3];
        //2.直接定义输入的3个车
        arr[0]=new Car("BMW",3000.00,"RED");
        arr[1]=new Car("老年代步车",30.00,"RED");
        arr[2]=new Car("电动车",2.00,"RED");
        
        
        Double sum=1.00;
        ////3.循环3次键盘输入品牌\价格\颜色
        for(int i=0;i<arr.length;i++) {
            //4.初始化Car c=new Car();
            Car c=arr[i];
            sum=sum+c.getPrice();
            System.out.println("品牌:"+c.getBrand()+" "+"价格:"+c.getPrice()+" "+"颜色:"+c.getColor());
        }
        System.out.println("sum:"+sum);
        
        //5.求平均值
        Double avg=1.00;
        avg=sum/arr.length;
        System.out.println("avg:"+avg);
        
    }

}

 再次练习

package com.fqs.demo1;

public class CarTest {
    public  static void main(String[]args) {
        //1.定义数组arr
        Car []arr=new Car[3];
        //2.数组[0],[1],[2]存值 打破常规右边 new Car(品牌,价格,颜色)
        arr[0]=new Car("bmw",1000.00,"red");
        arr[1]=new Car("bmw",1000.00,"red");
        arr[2]=new Car("bmw",1000.00,"red");
        //3.求和
        Double sum=0.00;
        for(int i=0;i<arr.length;i++) {
            sum=sum+arr[i].getPrice();
            
        }
        
        //4.求平均值
        Double avg=0.00;
        avg=sum/arr.length;
        System.out.println("avg:"+avg);
        
        
    }

}