Java基础之Switch语句案例

ゞ浴缸里的玫瑰 2022-06-04 07:49 279阅读 0赞

/\*  
从键盘上读入一个学生的成绩，存放在变量score中  
根据score的值输出其对应的成绩等级

score>=90 等级：A  
70<=score<90 等级：B  
60<=score<70 等级：C  
score<60 等级：D

使用switch结构实现  
\*/

import java.util.Scanner;
    public class Switch03{
        public static void main(String[] args){
    
            Scanner s = new Scanner(System.in);
            System.out.println("请输入一个成绩：");
            int Score = s.nextInt();
    
            s.close();
    
            if(Score>100 || Score <0){
                System.out.println("您输入的成绩有误，请重新输入...");
            }else{
                switch(Score/10){
                    case 10:
                    case 9:
                            System.out.println("A");
                            break;
                    case 8:
                    case 7:
                            System.out.println("B");
                            break;
                    case 6:
                            System.out.println("C");
                            break;
                    default:
                            System.out.println("D");
                }
            }
        }
    }

--------------------

/\*  
从键盘输入一个月份，打印该月份所属的季节  
3,4,5为春季 6,7,8为夏季  
9,10,11为秋季 12,1,2为冬季  
用switch-case完成需求  
\*/

**方法一：**

import java.util.Scanner;
    public class  Switch02
    {
        public static void main(String[] args) 
        {
            Scanner s = new Scanner(System.in);
    
            System.out.println("请输入一个月份：");
            int month = s.nextInt();
    
            s.close();
    
            switch(month){
                case 3:
                case 4:
                case 5:
                        System.out.println("春季");
                        break;
                case 6:
                case 7:
                case 8:
                        System.out.println("夏季");
                        break;
                case 9:
                case 10:
                case 11:
                        System.out.println("秋季");
                        break;
                case 12:
                case 1:
                case 2:
                        System.out.println("冬季");
                        break;
    
                default:
                        System.out.println("您输入的月份不存在，请重新输入...");
                        break;
            }
        }
    }

**方法二：**

import   java.util.Scanner;
    public class TestSwitch03 
    {
        public static void main(String[] args) 
        {
            Scanner s = new Scanner(System.in);
    
            System.out.println("请输入一个月份：");
    
            int month = s.nextInt();
    
            s.close();
    
            if(month < 1 || month > 12){
                    System.out.println("您输出的不是一个月份，别闹...");
            }else{
                    switch(month){
    
                        case 3:
                        case 4:
                        case 5:
                                    System.out.println("春季..");
                                    break;
    
                        case 6:
                        case 7:
                        case 8:
                                    System.out.println("夏季..");
                                    break;
                        case 9:
                        case 10:
                        case 11:
                                    System.out.println("秋季..");
                                    break;
    
                        default:
                                    System.out.println("冬季..");
                                    break;
    
                    }
            }
        }
    
    }