uplow.java

针对越来越多的用户喜欢JAVA

import java.io.*;
public class UpLow
  {
    public static void main(String args[]) throws IOException
    {
       char x;
       System.out.print("请输入一个字母:");
       x=(char)System.in.read();
       if (Character.isUpperCase(x))
         System.out.println("你输入的字母是大写");
       if (Character.isLowerCase(x))
         System.out.println("你输入的字母是小写!");
      }
    }