Convert a list to a delimited string.

     
/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the latest version of the GNU Lesser General
 * Public License as published by the Free Software Foundation;
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program (LICENSE.txt); if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
//package org.jamwiki.utils;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
 * This class provides a variety of basic utility methods that are not
 * dependent on any other classes within the org.jamwiki package structure.
 */
public class Utilities {
  private static Pattern VALID_IPV4_PATTERN = null;
  private static Pattern VALID_IPV6_PATTERN = null;
  private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
  private static final String ipv6Pattern = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";

  static {
    try {
      VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
      VALID_IPV6_PATTERN = Pattern.compile(ipv6Pattern, Pattern.CASE_INSENSITIVE);
    } catch (PatternSyntaxException e) {
      //logger.severe("Unable to compile pattern", e);
    }
  }
  /**
   * Convert a list to a delimited string.
   *
   * @param list The list to convert to a string.
   * @param delimiter The string to use as a delimiter.
   * @return A string consisting of the delimited list items, or <code>null</code> if the
   *  list is <code>null</code> or empty.
   */
  public static String listToDelimitedString(List<String> list, String delimiter) {
    if (delimiter == null) {
      throw new IllegalArgumentException("Attempt to call Utilities.delimitedStringToList with no delimiter specified");
    }
    if (list == null || list.isEmpty()) {
      return null;
    }
    String result = "";
    for (String item : list) {
      if (result.length() > 0) {
        result += delimiter;
      }
      result += item;
    }
    return result;
  }

}

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Convert a list to a delimited string. : String Convert « Data Type « Java

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