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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. import java.util.Collections;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		ArrayList<String> list = new ArrayList<>();
  14.         list.add("19.15.15.90:61234");
  15.         list.add("19.15.15.29:28010");
  16.         list.add("19.15.15.80:8998");
  17.         list.add("19.15.15.102:8998");
  18.         list.add("25.25.24.15:8998");
  19.         list.add("25.25.24.80:8998");
  20.         list.add("210.192.38.25:8998");
  21.         list.add("210.192.38.29:8998");
  22.  
  23.         // You should sort the list
  24.         Collections.sort(list);
  25.  
  26.         // may aswell print the first one
  27.         System.out.println(list.get(0));
  28.         for (int i = 1; i < list.size(); i++) {
  29.             int pos = nthIndexOf(list.get(i), '.', 3);
  30.             if (!list.get(i).substring(0, pos).equals(list.get(i - 1).substring(0, pos))) {
  31.                 System.out.println(list.get(i));
  32.             }
  33.         }
  34.     }
  35.  
  36.     public static int nthIndexOf(String text, char needle, int n) {
  37.         for (int i = 0; i < text.length(); i++) {
  38.             if (text.charAt(i) == needle) {
  39.                 n--;
  40.                 if (n == 0) {
  41.                     return i;
  42.                 }
  43.             }
  44.         }
  45.         return -1;
  46. 	}
  47. }
Success #stdin #stdout 0.08s 27956KB
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Standard input is empty
stdout
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19.15.15.102:8998
210.192.38.25:8998
25.25.24.15:8998
https://ideone.com/6trhLk
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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