Java从键盘上输入一个月份，然后判断该月份的天数

 

 

输入 

6

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。