Comparator uses a Collator to determine the proper, case-insensitive lexicographical ordering of two strings.

    

import java.text.Collator;
import java.util.Comparator;

class IgnoreCaseComp implements Comparator<String> {
  Collator col;

  IgnoreCaseComp() {
    col = Collator.getInstance();

    col.setStrength(Collator.PRIMARY);
  }

  public int compare(String strA, String strB) {
    return col.compare(strA, strB);
  }
}

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Comparator uses a Collator to determine the proper, case-insensitive lexicographical ordering of two strings. : Comparator « Collections Data Structure « Java

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