Thread: Convert object to String

Hi,
need help, hope you will help me.

import java.util.Arrays;
import java.util.Comparator;
 
class LastFirstComparator implements Comparator {
 
    public int compare(Object obj1, Object obj2) {
        int result = 0;
        int i = 0;
        String[] str1 = (String[]) obj1;   /// this seems not working, how to change to string type?
        String[] str2 = (String[]) obj2;  /// because it is working with String array.
 
        do {
            result = str1[i].compareTo(str2[i]);
            i++;
            if (i == 7) {
                break;
            }
        } while (result == 0);
 
        return result;
    }
}
 
public class LexiComparator {
 
    public static void main(String args[]) {
 
        Integer a1[][] = {{13, -2, 3, 99, 0, 9, 45},
            {2, 3, 9, 45, 4, 44, 21},
            {22, 445, 0, -5, -56, 6, 223}};
        Arrays.sort(a1, new LastFirstComparator());
    }
}

Please give some ideas. Thanks