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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 a = "+13334445678";
  13.         String b = "+1-23-45-67";
  14.         String c = "+1-333-444-5678";
  15.  
  16.         System.out.println(lastFour(a));
  17.         System.out.println(lastFour(b));
  18.         System.out.println(lastFour(c));
  19.     }
  20.  
  21.     public static String lastFour(String s) {
  22.         StringBuilder lastFour = new StringBuilder();
  23.         int check = 0;
  24.         for (int i = s.length() - 1; i >= 0; i--) {
  25.             if (Character.isDigit(s.charAt(i))) {
  26.                 check++;
  27.             }
  28.             if (check <= 4) {
  29.                 lastFour.append(s.charAt(i));
  30.             } else {
  31.                 lastFour.append(Character.isDigit(s.charAt(i)) ? "*" : s.charAt(i));
  32.             }
  33.         }
  34.         return lastFour.reverse().toString();
  35. 	}
  36. }
Success #stdin #stdout 0.08s 2841600KB
comments (?)
stdin
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Standard input is empty
stdout
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+*******5678
+*-**-45-67
+*-***-***-5678
https://ideone.com/jfV5Ac
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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