Simple way to sort strings in the case sensitive alphabetical order

Question

I need to sort list of strings in the alphabetical order   List lt String gt  list   new ArrayList    list add  development    list add  Development    list add  aa    list add  AA    list add  Aa      A common way to do it is to use comparator   Collections sort list  String CASE INSENSITIVE ORDER     The problem of the CaseInsensitiveComparator that    AA    is equals to    aa     Strings appear in the result according to the order of adding for the same values  and it is not correct    aa   AA   Aa   development   Development

User · Answer

The simple way to solve the problem is to use ComparisonChain from Guava http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/ComparisonChain.html

private static Comparator<String> stringAlphabeticalComparator = new Comparator<String>() {
        public int compare(String str1, String str2) {
            return ComparisonChain.start().
                                compare(str1,str2, String.CASE_INSENSITIVE_ORDER).
                                compare(str1,str2).
                                result();
         }
 };
Collections.sort(list, stringAlphabeticalComparator);

The first comparator from the chain will sort strings according to the case insensitive order, and the second comparator will sort strings according to the case insensitive order. As excepted strings appear in the result according to the alphabetical order:

"AA","Aa","aa","Development","development"

User · Answer

If you don t want to add a dependency on Guava  per Michael s answer  then this comparator is equivalent   private static Comparator lt String gt  ALPHABETICAL ORDER   new Comparator lt String gt          public int compare String str1  String str2            int res   String CASE INSENSITIVE ORDER compare str1  str2           if  res    0                res   str1 compareTo str2                     return res            Collections sort list  ALPHABETICAL ORDER     And I think it is just as easy to understand and code      The last 4 lines of the method can written more concisely as follows           return  res    0    res   str1 compareTo str2

User · Answer

Simply use  java util Collections sort list    without String CASE INSENSITIVE ORDER comparator parameter

User · Answer

I recently answered a similar question here  Applying the same approach to your problem would yield following solution   list sort    p2Ord stringOrd  stringOrd  comap new F lt String  P2 lt String  String gt  gt          public P2 lt String  String gt  f String s          return p s toLowerCase    s

[java] Simple way to sort strings in the (case sensitive) alphabetical order

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