Java Collection How to - Create a Comparator for comparing string ignoring case

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Question

We would like to know how to create a Comparator for comparing string ignoring case.

Answer

//w  w  w .j  a  va  2 s .c om
import java.util.Arrays;
import java.util.Comparator;

public class Main {

  public static void main(String[] args) {
    String[] sa = new String[] { "a", "c", "d" };
    AlphabeticComparator comp = new AlphabeticComparator();
    Arrays.sort(sa, comp);
    int index = Arrays.binarySearch(sa, sa[10], comp);
    System.out.println("Index = " + index);
  }
}

class AlphabeticComparator implements Comparator {
  public int compare(Object o1, Object o2) {
    String s1 = (String) o1;
    String s2 = (String) o2;
    return s1.toLowerCase().compareTo(s2.toLowerCase());
  }
}

The code above generates the following result.

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