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  1. import java.util.regex.Matcher;
  2. import java.util.regex.Pattern;
  3. import java.util.Scanner;
  4. /*
  5. IP address is a string in the form "A.B.C.D",
  6. where the value of A, B, C, and D may range from 0 to 255. Leading zeros are allowed.
  7.  
  8. Some valid IP address:
  9. 000.12.12.034
  10. 121.234.12.12
  11. 23.45.12.56
  12. Some invalid IP address:
  13. 000.12.234.23.23
  14. 666.666.23.23
  15. .213.123.23.32
  16. 23.45.22.32.
  17. I.Am.not.an.ip
  18.  
  19. Sample Input
  20. 000.12.12.034
  21. 121.234.12.12
  22. 23.45.12.56
  23. 00.12.123.123123.123
  24. 122.23
  25. Hello.IP
  26.  
  27.  
  28. */
  29. class Solution{
  30. 	public static void main(String[] args){
  31. 		Scanner in = new Scanner(System.in);
  32. 		while(in.hasNext()){
  33. 			String IP = in.next();
  34. 			System.out.println("Is IP->"+IP+" a valid ip : "+isValidIp(IP));
  35. 		}
  36. 	}
  37.  
  38. 	private static boolean isValidIp(String ipAddress){
  39. 		if(ipAddress == null || ipAddress.isBlank()){
  40. 			return false;
  41. 		}
  42. 		int length = ipAddress.length();
  43. 		if(length < 7 || length > 15){
  44. 			return false;
  45. 		}
  46. 		if(ipAddress.indexOf(".") == -1){
  47. 			return false;
  48. 		}
  49. 		String[] delimitedString = ipAddress.split("\\.");
  50. 		if(delimitedString == null || delimitedString.length != 4){
  51. 			return false;
  52. 		}
  53. 		for(String s : delimitedString){
  54. 			try{
  55. 				Integer value = Integer.valueOf(s);
  56. 				if(value < 0 || value > 255){
  57. 					return false;
  58. 				}
  59.  
  60. 			}
  61. 			catch(Exception e){
  62. 				return false;
  63. 			}
  64. 		}
  65. 		return true;
  66. 	}
  67. }
Success #stdin #stdout 0.17s 58796KB
comments (?)
stdin 
1.1.1.1
128.230.124.124
127.0.0.1
256.2.4.10
.4.1.8.8
000.12.12.034
121.234.12.12
23.45.12.56
00.12.123.123123.123
122.23
Hello.IP
stdout 
Is IP->1.1.1.1 a valid ip : true
Is IP->128.230.124.124 a valid ip : true
Is IP->127.0.0.1 a valid ip : true
Is IP->256.2.4.10 a valid ip : false
Is IP->.4.1.8.8 a valid ip : false
Is IP->000.12.12.034 a valid ip : true
Is IP->121.234.12.12 a valid ip : true
Is IP->23.45.12.56 a valid ip : true
Is IP->00.12.123.123123.123 a valid ip : false
Is IP->122.23 a valid ip : false
Is IP->Hello.IP a valid ip : false
https://ideone.com/w5mjhO
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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