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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 	 String initial[] = {"djsndni123412ndksnd3412*&^%34(*(*1234"
  13. 		,"djsndni123412ndksnd3412*&^%34(*(*123"};
  14. // remove all non-digits characters
  15. 	System.out.println(formatCardInput(initial[0].replaceAll("\\D", "")));
  16. 	System.out.println(formatCardInput(initial[1].replaceAll("\\D", "")));
  17. 	}
  18. 	private static String formatCardInput(String s){
  19. 		StringBuilder sb = new StringBuilder(s);
  20. 		System.out.println(sb);
  21. 		if(sb.length() == 16){
  22. 			int gap = 0;
  23. 			for (int i = 4; i< sb.length()-1;i+=4){
  24. 				sb.insert(i + gap,' ');
  25. 				gap++;
  26. 			}
  27. 		}
  28. 		else{
  29. 			sb.insert(4,' ');
  30. 			sb.insert(11,' ');
  31. 		}
  32. 	return sb.toString();
  33. 	}
  34. }
Success #stdin #stdout 0.1s 27904KB
comments (?)
stdin 
Standard input is empty
stdout 
1234123412341234
1234 1234 1234 1234 
123412341234123
1234 123412 34123
https://ideone.com/Jt1pxw
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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