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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.  
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		String[] array = {"string-a01","string-a20","string-a100","string-b01","string-b20","string-b100","string-c01","string-c20","string-c100"};
  14.  
  15.         Arrays.sort(array, new Comparator<String>() {
  16.         	int firstTrailingDigit(String s) {
  17.   				int i = s.length();
  18.   				while (i > 0 && Character.isDigit(s.charAt(i - 1))) {
  19.     				--i;	
  20.   				}
  21.   				return i;
  22. 			}
  23.  
  24. 			@Override public int compare(String a, String b) {
  25.   				int ftdA = firstTrailingDigit(a);
  26.   				int ftdB = firstTrailingDigit(b);
  27.  
  28.   				// Get the leading strings, and compare.
  29.   				String sA = a.substring(0, ftdA);
  30.   				String sB = b.substring(0, ftdB);
  31.   				int compareStrings = sA.compareTo(sB);
  32.   				if (compareStrings != 0) {
  33.     				// If they're not equal, return the result of the comparison.
  34.     				return compareStrings;
  35.   				}
  36.  
  37.   				// Get the trailing numbers from the strings, and compare.
  38.   				int iA = Integer.parseInt(a.substring(ftdA));
  39.   				int iB = Integer.parseInt(b.substring(ftdB));
  40.   				return Integer.compare(iA, iB);
  41. 			}
  42.         });
  43.  
  44.         System.out.println(Arrays.toString(array));
  45. 	}
  46. }
Success #stdin #stdout 0.04s 320576KB
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Standard input is empty
stdout
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[string-a01, string-a20, string-a100, string-b01, string-b20, string-b100, string-c01, string-c20, string-c100]
https://ideone.com/qn69m3
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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