Java从键盘上输入一个月份，然后判断该月份的天数

比眉伴天荒 2022-08-30 05:30 199阅读 0赞

![20210722121616462.png][]

**输入**

**输出**

6月份为30天

**这是对的**

package com;
    import java.io.*;
    public class app4_4 {
        public static void main(String[] args)throws Exception
        {
            int days;int month;
            BufferedReader buf;
            InputStreamReader inp;
            inp=new InputStreamReader(System.in);
            buf=new BufferedReader(inp);
            System.out.println("请输入月份：");
            month=Integer.parseInt(buf.readLine());
            switch((int)month) {
                case 2:
                    days = 28;
                    break;
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    days = 31;
                    break;
                default:
                    days = 30;
            }
            System.out.println(month+"月份为"+days+"天");
    
        }
    }

**错误示范**

package com;
    
    public class app4_4 {
        public static void main(String[] args)throws Exception
        {
            int days;char month;
            System.out.println("请输入月份：");
            month=(char)System.in.read();
            switch(month) {
                case 2:
                    days = 28;
                    break;
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    days = 31;
                    break;
                default:
                    days = 30;
            }
            System.out.println(month+"月份为"+days+"天");
    
        }
    }

**错误示范**

package com;
    
    public class app4_4 {
        public static void main(String[] args)throws Exception
        {
            int days;int month;
            System.out.println("请输入月份：");
            month=(char)System.in.read();
            switch(month) {
                case 2:
                    days = 28;
                    break;
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    days = 31;
                    break;
                default:
                    days = 30;
            }
            System.out.println((char)month+"月份为"+days+"天");
    
        }
    }

System.out.println((char)month+"月份为"+days+"天");

month前面需要加char，不然会打印出ascll值。

[20210722121616462.png]: /images/20220829/04bcbc0088fc4678af804d7613d64d86.png