Java：选择String类数组

Question

I am working on some sort algorithms for a school project and i have a problem . The following code its not sorting the array,I have tried the same code with array of numbers(the only change is in the if) and it was working but now with the String array and the use of compareTo its not working its just puts the items in "random" order.

public static void selectionSortISBN(Book pin[], int booksCounter) {
    for (int x = 0; x < booksCounter; x++) {
        int minIndex = x;
        for (int y = x + 1; y < booksCounter; y++) {
            if (pin[y].getISBN().compareTo(pin[minIndex].getISBN()) < 0) {
                minIndex = y;
            }
        }
        Book temp = pin[x];
        pin[x] = pin[minIndex];
        pin[minIndex] = temp;
    }
}

EDIT:

I changed my inner for to this :

        for (int y = x + 1; y < booksCounter; y++) {
            int com=pin[y].getISBN().compareTo(pin[minIndex].getISBN());
            System.out.println(pin[y].getISBN()+"   "+pin[minIndex].getISBN()+"  =   "+com);
        }

and the output i am getting is this

1537   1485  =   1
596   1485  =   4
1164   1485  =   -3
909   1485  =   8
596   1537  =   4
1164   1537  =   -4
909   1537  =   8
1164   596  =   -4
909   596  =   4
909   1164  =   8

Answer 1

This is working correctly, the mistake you are making is that you expect "596" to be under "1485", when it is not, you are sorting them as strings, 596 > 1485 just like BA > AAAABA. Add leading zeroes if you want to compare numbers alphanumerically.

Answer 2

如果只处理数字，则将字符串数组转换为数字数组