Here you can find the source of join(Collection objects, String delim)
| Parameter | Description |
|---|---|
| objects | A collection the items to be joined. This collection can contain objects of any type; each object's <tt>toString()</tt> method is called to produce the string to be joined. |
| delim | the delimiter string |
public static String join(Collection<? extends Object> objects, String delim)
//package com.java2s; /*---------------------------------------------------------------------------*\ $Id: a2e18c1fd38fa21f86084fbdb2c0045cec86bd20 $ --------------------------------------------------------------------------- This software is released under a BSD-style license: //w w w. j a v a 2 s . c o m Copyright (c) 2004-2007 Brian M. Clapper. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. The end-user documentation included with the redistribution, if any, must include the following acknowlegement: "This product includes software developed by Brian M. Clapper (bmc@clapper.org, http://www.clapper.org/bmc/). That software is copyright (c) 2004-2007 Brian M. Clapper." Alternately, this acknowlegement may appear in the software itself, if wherever such third-party acknowlegements normally appear. 3. Neither the names "clapper.org", "clapper.org Java Utility Library", nor any of the names of the project contributors may be used to endorse or promote products derived from this software without prior written permission. For written permission, please contact bmc@clapper.org. 4. Products derived from this software may not be called "clapper.org Java Utility Library", nor may "clapper.org" appear in their names without prior written permission of Brian M. Clapper. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRIAN M. CLAPPER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. \*---------------------------------------------------------------------------*/ import java.util.Collection; import java.util.Iterator; public class Main { /** * Join a set of strings into one string, putting the specified delimiter * between adjacent strings. * * @param strings the strings to be joined * @param delim the delimiter string * * @return the joined string, or "" if the array is empty. * * @see #split(String,String) * @see #join(String[],char) */ public static String join(String[] strings, String delim) { StringBuilder result = new StringBuilder(); String sep = ""; for (int i = 0; i < strings.length; i++) { result.append(sep); result.append(strings[i]); sep = delim; } return result.toString(); } /** * Join a set of strings into one string, putting the specified delimiter * between adjacent strings. This version of <tt>join()</tt> supports the * new Java variable argument syntax. * * @param delim the delimiter string * @param strings the strings to be joined * * @return the joined string, or "" if the array is empty. * * @see #split(String,char) * @see #join(String[],String) */ public static String join(String delim, String... strings) { return join(strings, delim); } /** * Join an array of strings into one string, putting the specified * delimiter between adjacent strings. * * @param strings the strings to be joined * @param delim the delimiter character * * @return the joined string, or "" if the array is empty. * * @see #split(String,char) * @see #join(String[],String) */ public static String join(String[] strings, char delim) { return join(strings, "" + delim); } /** * Join an array of strings into one string, putting the specified * delimiter between adjacent strings, starting at a specified index. * * @param strings the strings to be joined * @param start starting index * @param end one past the ending index * @param delim the delimiter character * * @return the joined string, or "" if the array is empty. * * @throws ArrayIndexOutOfBoundsException bad value for <tt>start</tt> * or <tt>end</tt> * * @see #split(String,char) * @see #join(String[],String) */ public static String join(String[] strings, int start, int end, char delim) { return join(strings, start, end, "" + delim); } /** * Join an array of strings into one string, putting the specified * delimiter between adjacent strings, starting at a specified index. * * @param strings the strings to be joined * @param start starting index * @param end one past the ending index * @param delim the delimiter string * * @return the joined string, or "" if the array is empty. * * @throws ArrayIndexOutOfBoundsException bad value for <tt>start</tt> * or <tt>end</tt> * * @see #split(String,char) * @see #join(String[],String) */ public static String join(String[] strings, int start, int end, String delim) { StringBuilder result = new StringBuilder(); String sep = ""; while (start < end) { result.append(sep); result.append(strings[start]); sep = delim; start++; } return result.toString(); } /** * Join a set of strings into one string, putting the specified delimiter * between adjacent strings. This version of <tt>join()</tt> supports the * new Java variable argument syntax. * * @param delim the delimiter character * @param strings the strings to be joined * * @return the joined string, or "" if the array is empty. * * @see #split(String,char) * @see #join(String[],String) */ public static String join(char delim, String... strings) { return join(strings, "" + delim); } /** * Join a set of strings into one string, putting the specified delimiter * between adjacent strings. * * @param objects A collection the items to be joined. This collection * can contain objects of any type; each object's * <tt>toString()</tt> method is called to produce the * string to be joined. * @param delim the delimiter string * * @return the joined string, or "" if the collection is empty. * * @see #split(String,String,Collection) * @see #join(Collection,char) */ public static String join(Collection<? extends Object> objects, String delim) { String result = ""; if (objects.size() > 0) { String[] array; int i; Iterator it; i = 0; for (it = objects.iterator(); it.hasNext();) { Object o = it.next(); if (o == null) continue; i++; } array = new String[i]; i = 0; for (it = objects.iterator(); it.hasNext();) { Object o = it.next(); if (o == null) continue; array[i++] = o.toString(); } result = join(array, delim); } return result; } /** * Join a set of strings into one string, putting the specified delimiter * between adjacent strings. * * @param objects A collection the items to be joined. This collection * can contain objects of any type; each object's * <tt>toString()</tt> method is called to produce the * string to be joined. * @param delim the delimiter character * * @return the joined string, or "" if the collection is empty. * * @see #split(String,char,Collection) * @see #join(Collection,String) */ public static String join(Collection<? extends Object> objects, char delim) { return join(objects, "" + delim); } }