[Java知识库]案例：减肥计划（if版与switch版）

需求：输入星期数，显示今天的减肥活动

周一：跑步

周二：游泳

周三：慢走

周四：动感单车

周五：拳击

周六：爬山

周日：好好吃一顿

代码实现：

if版

import java.util.Scanner;

public class MethodDemo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入星期数:");
        int day = sc.nextInt();
        loseWeight(day);
    }

    public static void loseWeight(int day) {
        if(day>=1&& day<=7){
        if (day == 1) {
            System.out.println("今日计划:跑步");
        } else if (day == 2) {
            System.out.println("今日计划:游泳");
        } else if (day == 3) {
            System.out.println("今日计划:慢走");
        } else if (day == 4) {
            System.out.println("今日计划:动感单车");
        } else if (day == 5) {
            System.out.println("今日计划:拳击");
        } else if (day == 6) {
            System.out.println("今日计划:爬山");
        } else {
            System.out.println("今日计划:好好吃一顿");
        }}
        else
        {
            System.out.print("输入错误！");
        }
    }

switch版

import java.util.Scanner;

public class MethodDemo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入星期数:");
        int day = sc.nextInt();
        loseWeight(day);
    }

    public static void loseWeight(int day) {
        switch (day) {
            case 1:
                System.out.println("今日计划：跑步");
                break;
            case 2:
                System.out.println("今日计划：游泳");
                break;
            case 3:
                System.out.println("今日计划：慢走");
                break;
            case 4:
                System.out.println("今日计划：动感单车");
                break;
            case 5:
                System.out.println("今日计划：拳击");
                break;
            case 6:
                System.out.println("今日计划：爬山");
                break;
            case 7:
                System.out.println("今日计划：好好吃一顿");
                break;
            default:
                System.out.print("输入错误");


        }
    }
}