How can I sort this ArrayList the way that I want?

Question

Here is a simple sorting program of an ArrayList:

ArrayList list = new ArrayList();

list.add(\"1_Update\");
list.add(\"11_Add\")         


        

Answer 1

You could write a custom comparator:

Collections.sort(list, new Comparator() {
    public int compare(String a, String b) {
        return Integer.signum(fixString(a) - fixString(b));
    }
    private int fixString(String in) {
        return Integer.parseInt(in.substring(0, in.indexOf('_')));
    }
});