Reverse the split operation. : String Join « Data Type « Java






  1. Java
  2. Data Type
  3. String Join

Reverse the split operation.

    
import java.util.Collection;
import java.util.Iterator;

/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/util/branches/sakai_2-5-4/util-util/util/src/java/org/sakaiproject/util/StringUtil.java $
 * $Id: StringUtil.java 34934 2007-09-10 22:52:23Z lance@indiana.edu $
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
 * 
 * Licensed under the Educational Community License, Version 1.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at
 * 
 *      http://www.opensource.org/licenses/ecl1.php
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 *
 **********************************************************************************/



/**
 * <p>
 * StringUtil collects together some string utility classes.
 * </p>
 */
public class StringUtil
{
  /**
   * Reverse the split operation.
   * 
   * @param parts
   *        The parts to combine
   * @param index
   *        the index to the fist part to use
   * @param length
   *        the number of parts to use
   * @param splitter
   *        The between-parts text
   */
  public static String unsplit(String[] parts, int index, int length, String splitter)
  {
    if (parts == null) return null;
    if ((index < 0) || (index >= parts.length)) return null;
    if (index+length > parts.length) return null;

    StringBuilder buf = new StringBuilder();
    for (int i = index; i < index+length; i++)
    {
      if (parts[i] != null) buf.append(parts[i]);
      buf.append(splitter);
    }

    // remove the trailing splitter
    buf.setLength(buf.length()-splitter.length());
    return buf.toString();
  }

}








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4.Joins the elements of Collection into a single String with string separator.
5.Joins the elements of Iterator into a single with char value as separator.
6.Joins the elements of the provided Collection into a single String containing the provided elements.
7.Joins the elements of the provided Iterator into a single String containing the provided elements.
8.Joins the elements of the provided array into a single String containing the provided list of elements.
9.Split and join strings
10.Split and join strings 2
11.Join String
12.Concatenates two arrays of strings
13.Join an array of strings into one delimited string
14.Remove/collapse multiple spaces.
15.Converts a String array to an String, joined by the Seperator