A comparator for String representing numbers, where 1.10 is greater than 1.1 and 1.2, like a table of contents.

TocComparator.java

private static class TocComparator implements Comparator<String>{
    public int compare(String s1, String s2){
        Integer s1front = Integer.parseInt(s1.substring(0, s1.indexOf('.')));
        Integer s2front = Integer.parseInt(s2.substring(0, s2.indexOf('.')));
        if(s1front.equals(s2front)){
            Integer f1ass = Integer.parseInt(s1.substring(s1.indexOf('.')+1));
	    Integer f2ass = Integer.parseInt(s2.substring(s2.indexOf('.')+1));
	    return f1ass.compareTo(f2ass);
        }
	else{
	    return s1front.compareTo(s2front);
	}
    }
}