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Thread: Convert object to String

  1. #1
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    Default 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
    Last edited by helloworld922; March 14th, 2010 at 11:45 AM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Convert object to String

    The class Object has a method toString() which will return a string that describes the object. By default, this returns:
    getClass().getName() + '@' + Integer.toHexString(hashCode())
    Programmers can override this method in their objects to return a more customized description of an object.

  3. #3
    Super Moderator Json's Avatar
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    Default Re: Convert object to String

    What exception do you get? A class cast exception?

    // Json

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