一、案例练习

package com.lkbhua.Test5;

public class Phone {
    private String brand; // 品牌
    private int price; // 价格
    private String color; // 颜色

    public Phone() {
    }

    public Phone(String brand, int price, String color) {
        this.brand = brand;
        this.price = price;
        this.color = color;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }
    public String getBrand() {
        return brand;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public int getPrice() {
        return price;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public String getColor() {
        return color;
    }
}

package com.lkbhua.Test5;

public class PhoneTest {

    public static void main(String[] args) {
        // 1、创建一个数组
        Phone[] arr = new Phone[3];

        // 2、创建手机的对象
        Phone phone1 = new Phone("iphone", 8888, "黑色"   );
        Phone phone2 = new Phone("华为", 6666, "蓝色"   );
        Phone phone3 = new Phone("小米", 3333, "白色"   );

        // 3、将手机对象，保存到数组中
        arr[0] = phone1;
        arr[1] = phone2;
        arr[2] = phone3;

        // 4、遍历数组，并输出手机信息
        for (int i = 0; i < arr.length; i++) {
            Phone p = arr[i];
            System.out.println(p.getBrand() + ":" + p.getPrice() + ":" + p.getColor());
        }
        System.out.println("------------------------------------------------");

        // 5、获取手机的平均价格
        int sum = 0;
        for (int i = 0; i < arr.length; i++) {
            Phone p = arr[i];
            sum = sum + p.getPrice();
        }

        int avg = sum / arr.length;
        System.out.println("平均价格：" + avg);

    }


}

二、案例需求2

package com.lkbhua.Test6;

public class Girls {
    private String name;
    private int age;
    private int height;
    private int hobby;

    public Girls() {
    }

    public Girls(String name, int age, int height, int hobby) {
        this.name = name;
        this.age = age;
        this.height = height;
        this.hobby = hobby;
    }

    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getAge() {
        return age;
    }
    public void setHeight(int height) {
        this.height = height;
    }
    public int getHeight() {
        return height;
    }
    public void setHobby(int hobby) {
        this.hobby = hobby;
    }
    public int getHobby() {
        return hobby;
    }

}

package com.lkbhua.Test6;

public class GirlsTest {
    public static void main(String[] args) {
        // 1、定义一个数组
        Girls[] arr = new Girls[4];

        // 2、创建对象
        Girls g1 = new Girls("张三", 18, 170, 1);
        Girls g2 = new Girls("李四", 19, 160, 2);
        Girls g3 = new Girls("王五", 20, 180, 3);
        Girls g4 = new Girls("赵六", 21, 190, 4);

        // 3、将创建的对象保存到数组中
        arr[0] = g1;
        arr[1] = g2;
        arr[2] = g3;
        arr[3] = g4;

        // 4、遍历数组，并输出对象中的数据
        for (int i = 0; i < arr.length; i++) {
            Girls g = arr[i];
            System.out.println(arr[i].getName() + ":" + arr[i].getAge() + ":" + arr[i].getHeight() + ":" + arr[i].getHobby());
        }
        System.out.println("------------------------------------------------");

        // 5、获取数组中元素的平均年龄
        int sum = 0;
        for (int i = 0; i < arr.length; i++) {
            Girls g = arr[i];
            sum = sum + g.getAge();
        }
        int avg = sum / arr.length;
        System.out.println("平均年龄为：" + avg);
        System.out.println("------------------------------------------------");

        // 6、统计有几个年龄比平均年龄小
        int count = 0;
        for (int i = 0; i < arr.length; i++) {
            Girls g = arr[i];
            if (g.getAge() < avg) {
                count++;
                System.out.println(g.getName()+":"+g.getAge()+":"+g.getHeight()+":"+g.getHobby());
            }
        }
        System.out.println("年龄比平均年龄小的有：" + count + "个");



    }
}

声明：

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