How to override the existing compare method of collections in Java

package MyPackage;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;


public class CoreUtils {
 
 static List addLst = new ArrayList();
 

 public static void main(String[] args) {
  String[] dataSet1 = { "Sam,sam@gmail.com","AAA" };
  String[] dataSet2 = { "Jenny,thomson,jenny@gmail.com","XXXX" };
  String[] dataSet3 = { "tom,Hanks,tom.hanks@gmail.com","GGGG" };
  
  
  addToList(dataSet1);
  addToList(dataSet2);
  addToList(dataSet3);
  
  /** Sorting Based upon the First String in the String Array
   * 
   */
  Collections.sort(addLst, new Comparator() {
   @Override
   public int compare(String[] o1, String[] o2) {
    return o1[0].compareToIgnoreCase(o2[0]);
   }
  });

  for (String[] array : addLst) {
   for (String element : array)
    System.out.print(element + ",");
   System.out.println();
  }
  
 }
 
 public static void addToList(String[] toBeAdded){
  addLst.add(toBeAdded);
 }
}