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

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Java Tutorial » Data Type » Substring 
2. 34. 15. Count the number of instances of substring within a string
/*
  * JBoss, Home of Professional Open Source
  * Copyright 2005, JBoss Inc., and individual contributors as indicated
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
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  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * This software is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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  *
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  * License along with this software; if not, write to the Free
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  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
  */



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));
  }

}
2. 34. Substring
2. 34. 1. Get the difference between two strings
2. 34. 2. Gets a substring from the specified String avoiding exceptions.
2. 34. 3. Gets len characters from the middle of a String.
2. 34. 4. Gets the String that is nested in between two Strings. Only the first match is returned.
2. 34. 5. Gets the String that is nested in between two instances of the same String.
2. 34. 6. Gets the leftmost len characters of a String
2. 34. 7. Gets the rightmost len characters of a String.
2. 34. 8. Gets the substring after the first occurrence of a separator. The separator is not returned.
2. 34. 9. Gets the substring before the last occurrence of a separator. The separator is not returned.
2. 34. 10. Removes a substring only if it is at the begining of a source string, otherwise returns the source string.
2. 34. 11. Removes a substring only if it is at the end of a source string, otherwise returns the source string.
2. 34. 12. Substitute sub-strings in side of a string
2. 34. 13. Searches a String for substrings delimited by a start and end tag, returning all matching substrings in an array.
2. 34. 14. Counts how many times the substring appears in the larger String.
2. 34. 15. Count the number of instances of substring within a string
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