IP判断 （Java代码）

解题思路:





注意事项:





参考代码:

import java.util.Iterator;

import java.util.Scanner;

public class Main

{

public static void main(String[] args)

{

Scanner input = new Scanner(System.in);

while (input.hasNext())

{

String str = input.nextLine();

String[] word = str.split("\\.");

if (CheckEle.check(word))

{

System.out.println("Y");

} else

{

System.out.println("N");

}

}

}

}

class CheckEle

{

public static boolean check(String[] word)

{

for (String string : word)

{

if (!check(string))

{

return false;

}

}

return true;

}

public static boolean check(String s)

{

int n = 0;

try

{

n = Integer.valueOf(s);

} catch (Exception e)

{

return false;

}

return n <= 255 && n >= 0;

}

}