Java Collection Join join(final Collection collection, final String separator)

Description

join

License

Open Source License

Declaration

public static String join(final Collection<String> collection, final String separator) 

Method Source Code

//package com.java2s;
/*/*from   w  w w.j ava 2 s .  c  om*/
 *
 * SchemaCrawler
 * http://sourceforge.net/projects/schemacrawler
 * Copyright (c) 2000-2015, Sualeh Fatehi.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

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

import java.util.Iterator;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class Main {
    public static String join(final Collection<String> collection, final String separator) {
        if (collection == null || collection.isEmpty()) {
            return null;
        }

        final StringBuilder buffer = new StringBuilder();
        for (final Iterator<String> iterator = collection.iterator(); iterator.hasNext();) {
            buffer.append(iterator.next());
            if (iterator.hasNext()) {
                buffer.append(separator);
            }
        }

        return buffer.toString();
    }

    public static String join(final Map<String, String> map, final String separator) {
        if (map == null || map.isEmpty()) {
            return null;
        }

        final StringBuilder buffer = new StringBuilder();
        final Set<Entry<String, String>> entrySet = map.entrySet();
        for (final Iterator<Entry<String, String>> iterator = entrySet.iterator(); iterator.hasNext();) {
            final Entry<String, String> entry = iterator.next();
            buffer.append(entry.getKey()).append("=").append(entry.getValue());
            if (iterator.hasNext()) {
                buffer.append(separator);
            }
        }

        return buffer.toString();
    }

    public static String join(final String[] collection, final String separator) {
        return join(Arrays.asList(collection), separator);
    }
}

Related

1. join(final Collection list, final String inbetween)
2. join(final Collection strings, String delimeter)
3. join(final Collection