fork download
copy 
  1. import java.util.regex.Matcher;
  2. import java.util.regex.Pattern;
  3. import java.util.Scanner;
  4.  
  5. class Solution{
  6. 	public static void main(String[] args){
  7. 		Scanner in = new Scanner(System.in);
  8. 		while(in.hasNext()){
  9. 			String IP = in.nextLine();
  10. 			if (isValidIp(IP)) {
  11. 				System.out.println("true");
  12. 			} else {
  13. 				System.out.println("false");
  14. 			}
  15. 		}
  16. 		in.close();
  17. 	}
  18.  
  19. 	public static boolean isValidIp(String ip) {
  20. 		String[] parts = ip.split("\\.");
  21.  
  22. 		if (parts.length != 4) {
  23. 			return false;
  24. 		}
  25.  
  26. 		for (String part: parts) {
  27. 			try {
  28. 				int num = Integer.parseInt(part);
  29. 				if (num < 0 || num >255) {
  30. 					return false;
  31. 				}
  32.  
  33. 				if (part.length() > 1 && part.charAt(0) == '0') return false;
  34. 			} catch (NumberFormatException e) {
  35. 				return false;
  36. 			}
  37. 		}
  38. 		return true;
  39. 	}
  40. }
Success #stdin #stdout 0.14s 56640KB
comments (?)
stdin
copy 
1.1.1.1
128.230.124.124
127.0.0.1
256.2.4.10
.4.1.8.8
stdout
copy 
true
true
true
false
false
https://ideone.com/FP9SK0
language:
Java (HotSpot 12)
created:
5 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!