CollationKey and Collator.getInstance : Collator « I18N « Java Tutorial

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import java.text.CollationKey;
import java.text.Collator;
import java.util.Locale;

public class KeysDemo {

  public static void sortArray(CollationKey[] keys) {

    CollationKey tmp;

    for (int i = 0; i < keys.length; i++) {
      for (int j = i + 1; j < keys.length; j++) {
        // Compare the keys
        if (keys[i].compareTo(keys[j]) > 0) {
          // Swap keys[i] and keys[j]
          tmp = keys[i];
          keys[i] = keys[j];
          keys[j] = tmp;
        }
      }
    }
  }

  static void displayWords(CollationKey[] keys) {

    for (int i = 0; i < keys.length; i++) {
      System.out.println(keys[i].getSourceString());
    }
  }

  static public void main(String[] args) {

    Collator enUSCollator = Collator.getInstance(new Locale("en", "US"));

    String[] words = { "peach", "apricot", "grape", "lemon" };

    CollationKey[] keys = new CollationKey[words.length];

    for (int k = 0; k < keys.length; k++) {
      keys[k] = enUSCollator.getCollationKey(words[k]);
    }

    sortArray(keys);
    displayWords(keys);
  }
}