Count the number of instances of substring within a string : Substring « Data Type « Java Tutorial

1. Java Tutorial
2. Data Type
3. Substring

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public class Main{


  /////////////////////////////////////////////////////////////////////////
  //                          Counting Methods                           //
  /////////////////////////////////////////////////////////////////////////

  /**
   * Count the number of instances of substring within a string.
   *
   * @param string     String to look for substring in.
   * @param substring  Sub-string to look for.
   * @return           Count of substrings in string.
   */
  public static int count(final String string, final String substring)
  {
     int count = 0;
     int idx = 0;

     while ((idx = string.indexOf(substring, idx)) != -1)
     {
        idx++;
        count++;
     }

     return count;
  }

  /**
   * Count the number of instances of character within a string.
   *
   * @param string     String to look for substring in.
   * @param c          Character to look for.
   * @return           Count of substrings in string.
   */
  public static int count(final String string, final char c)
  {
     return count(string, String.valueOf(c));
  }

}