Java Array Join join(Object[] array, String separator)

Description

Joins the elements of the provided array into a single string containing the provided list of elements.

License

Apache License

Parameter

Parameter	Description
array	the array of values to join together
separator	the separator character to use

Return

the joined String

Declaration

public static String join(Object[] array, String separator) 

Method Source Code

//package com.java2s;
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved./*from www  . jav  a  2  s. c  o  m*/
 *
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Software Foundation.
 *
 * 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 THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.util.Iterator;

public class Main {
    /**
     * Joins the elements of the provided array into a single string
     * containing the provided list of elements. 
     * No delimiter is added before or after the list.
     * A null separator is the same as a blank String.
     *
     * @param array  the array of values to join together
     * @param separator  the separator character to use
     * @return the joined String
     */
    public static String join(Object[] array, String separator) {
        if (separator == null) {
            separator = "";
        }
        int arraySize = array.length;
        int bufSize = (arraySize == 0 ? 0 : (array[0].toString().length() + separator.length()) * arraySize);
        StringBuffer buf = new StringBuffer(bufSize);

        for (int i = 0; i < arraySize; i++) {
            if (i > 0) {
                buf.append(separator);
            }
            buf.append(array[i]);
        }
        return buf.toString();
    }

    /**
     * Joins the elements of the provided iterator into a single string
     * containing the provided elements.
     * No delimiter is added before or after the list.
     * A null separator is the same as a blank String.
     *
     * @param iterator  the iterator of values to join together
     * @param separator  the separator character to use
     * @return the joined String
     */
    public static String join(Iterator iterator, String separator) {
        if (separator == null) {
            separator = "";
        }
        StringBuffer buf = new StringBuffer(256); // Java default is 16, probably too small
        while (iterator.hasNext()) {
            buf.append(iterator.next());
            if (iterator.hasNext()) {
                buf.append(separator);
            }
        }
        return buf.toString();
    }
}

Related

1. join(Object[] array, String separator)
2. join(Object[] array, String separator)
3. join(Object[] array, String separator)
4. join(Object[] array, String separator)
5. join(Object[] array, String separator)
6. join(Object[] array, String seperator)
7. join(Object[] elements, CharSequence separator)
8. join(Object[] elements, String glue)
9. join(Object[] objects)