2.25testmonth.java

JAVA程序设计的源代码

import java.io.*;
public class TestMonth
{
public static void main(String args[])throws IOException
{
String s;
int month;
BufferedReader keyin=new BufferedReader(new InputStreamReader(System.in));
System.out.print("input a month(1-12):");
s=keyin.readLine();    //从键盘输入
month=Integer.parseInt(s);    //将输入转换成整形数据

switch(month)
{
case 1:    //根据switch语句特点，将几种情况合并进行处理
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
System.out.println("month "+month+" has 31 days.");    
break;
case 4:
case 6:
case 9:
case 11:
System.out.println("month "+month+" has 30 days.");
break;
case 2:
System.out.println("month "+month+" has 28 or 29 days.");
break;
default:    //输入错误采用default处理
System.out.println("error input.");
break;
}
}
}