Java String Substring Count countSubstringOccurrances(String s1, String SubString)

Description

return the number of times the substring occurs in the text - where there are overlaps the count tells how many times the substring could be replaced

License

Apache License

Parameter

Parameter	Description
s1	non-null input string to test
SubString	non-null Substring to cound

Return

non-negative number of occurrances of the substring

Declaration

public static int countSubstringOccurrances(String s1, String SubString)

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    /**/*  ww w  .j a va 2 s. c o m*/
     * return the number of times the substring occurs in the text -
     * where there are overlaps the count tells how many times the substring could be replaced
     * @param s1 non-null input string to test
     * @param SubString non-null Substring to cound
     * @return non-negative number of occurrances of the substring
     */
    public static int countSubstringOccurrances(String s1, String SubString) {
        int count = 0;
        int index = s1.indexOf(SubString);
        int sublength = SubString.length();
        int start = 0;
        while (index > -1) {
            count++;
            start = index + sublength;
            if (start > s1.length() - sublength)
                return (count);
            index = s1.indexOf(SubString, start);
        }
        return (count);
    }
}