Java Array Concatenate concatenate(Object[] array)

Description

Concatenates elements of an array into a single string.

License

Apache License

Parameter

Parameter	Description
array	the array of values to concatenate.

Return

the concatenated string.

Declaration

public static String concatenate(Object[] array) 

Method Source Code

//package com.java2s;
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.//ww w  . j  av a  2s. c  o m
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 * 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.
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 * 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.
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 * 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
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 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
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 *    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
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * This software consists of voluntary contributions made by many
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import java.util.Iterator;

public class Main {
    /**
     * Concatenates elements of an array into a single string.
     * The difference from join is that concatenate has no delimiter.
     * 
     * @param array  the array of values to concatenate.
     * @return the concatenated string.
     */
    public static String concatenate(Object[] array) {
        return join(array, "");
    }

    /**
     * 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. concatenate(double[] p1, double[] p2)
2. concatenate(float[][] a, float[][] b, int dim)
3. concatenate(int[]... arrays)
4. concatenate(Object[] array)
5. concatenate(Object[] array)
6. concatenate(Object[] array)
7. concatenate(Object[] collection)
8. concatenate(String[] args)
9. concatenate(String[] strings, String sep)