天空下的雨

public class Reverse
{
    public static void main()
            {
                 if(args.length>0)
                 {
                     StringBuffer a = new StringBuffer(args[0]);
                     a = a.reverse();
                     System.out.println(a);                
                 }
                 else
                   {
                     System.out.println("输入错误");
                 } 
            }

}