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

Description

Joins the elements of an array together separated by the given separator.

License

Open Source License

Parameter

Parameter	Description
array	a parameter
separator	a parameter

Declaration

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

Method Source Code

//package com.java2s;
/*/*from   w  w w .  j a v a  2  s. c  o  m*/
 * This file is part of Nexus.
 *
 * Nexus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Nexus 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Nexus.  If not, see <http://www.gnu.org/licenses/>.
 */

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

public class Main {
    private static final String EMPTY = "";

    /**
     * Joins the elements of an iterator together separated by the given separator.
     *
     * @param iterator
     * @param separator
     * @return
     */
    public static String join(Iterator iterator, char separator) {
        if (iterator == null) {
            return null;
        }
        if (!iterator.hasNext()) {
            return EMPTY;
        }
        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first.toString();
        }

        StringBuilder buf = new StringBuilder(256);
        if (first != null) {
            buf.append(first);
        }

        while (iterator.hasNext()) {
            buf.append(separator);
            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }

        return buf.toString();
    }

    /**
     * Joins the elements of an iterator together separated by the given separator.
     *
     * @param iterator
     * @param separator
     * @return
     */
    public static String join(Iterator iterator, String separator) {
        if (iterator == null) {
            return null;
        }
        if (!iterator.hasNext()) {
            return EMPTY;
        }
        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first.toString();
        }

        StringBuilder buf = new StringBuilder(256);
        if (first != null) {
            buf.append(first);
        }

        while (iterator.hasNext()) {
            if (separator != null) {
                buf.append(separator);
            }
            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }
        return buf.toString();
    }

    /**
     * Joins the elements of a collection together separated by the given separator.
     *
     * @param collection
     * @param separator
     * @return
     */
    public static String join(Collection collection, char separator) {
        if (collection == null) {
            return null;
        }
        return join(collection.iterator(), separator);
    }

    /**
     * Joins the elements of a collection together separated by the given separator.
     *
     * @param collection
     * @param separator
     * @return
     */
    public static String join(Collection collection, String separator) {
        if (collection == null) {
            return null;
        }
        return join(collection.iterator(), separator);
    }

    /**
     * Joins the elements of an array together separated by the given separator.
     *
     * @param array
     * @param separator
     * @return
     */
    public static String join(Object[] array, char separator) {
        if (array == null) {
            return null;
        }
        return join(Arrays.asList(array), separator);
    }

    /**
     * Joins the elements of an array together separated by the given separator.
     *
     * @param array
     * @param separator
     * @return
     */
    public static String join(Object[] array, String separator) {
        if (array == null) {
            return null;
        }
        return join(Arrays.asList(array), separator);
    }
}

Related

1. join(Object[] array)
2. join(Object[] array)
3. join(Object[] array)
4. join(Object[] array)
5. join(Object[] array, char separator)
6. join(Object[] array, char separator)
7. join(Object[] array, char separator)
8. join(Object[] array, char separator, int startIndex, int endIndex)
9. join(Object[] array, String delim)