Java - How to find substring occurrences in a String?

Java String Manipulation Java 

Following code shows how to find frequency of a substring in a given string.

public class SubstringOccurrence {
    public static int getOccurrenceOfSubstring(final String input, String substring) {
        if (input == null || substring == null || substring.length()==0) {
            return 0;
        }
        Matcher matcher = Pattern.compile(Pattern.quote(substring))
                                 .matcher(input);
        int count = 0;
        for (; matcher.find(); count++)
            ;
        return count;
    }

    public static void main(String[] args) {
        String input = "Is yours and yours and yours...";
        int c = getOccurrenceOfSubstring(input, "yours");
        System.out.println(c);
        c = getOccurrenceOfSubstring(input, "and");
        System.out.println(c);
        c = getOccurrenceOfSubstring(input, "s");
        System.out.println(c);
        c = getOccurrenceOfSubstring(input, " ");
        System.out.println(c);
        c = getOccurrenceOfSubstring(input,"");
        System.out.println(c);
        c = getOccurrenceOfSubstring(input,".");
        System.out.println(c);
    }
}

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