Java Collection Join join(String separator, Collection objects)

Description

join

License

Open Source License

Declaration

public static <T> String join(String separator, Collection<T> objects) 

Method Source Code

//package com.java2s;
/*/*from  w  w w. ja v a  2s  . c om*/
 * The MIT License
 *
 * Copyright (c) 2013 The Broad Institute
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.util.Collection;

import java.util.Iterator;

public class Main {
    public static <T> String join(String separator, Collection<T> objects) {
        if (objects.isEmpty()) {
            return "";
        }
        Iterator<T> iter = objects.iterator();
        final StringBuilder ret = new StringBuilder(iter.next().toString());
        while (iter.hasNext()) {
            ret.append(separator);
            ret.append(iter.next().toString());
        }

        return ret.toString();
    }

    /**
     * join an array of strings given a seperator
     *
     * @param separator the string to insert between each array element
     * @param strings   the array of strings
     * @return a string, which is the joining of all array values with the separator
     */
    public static String join(String separator, String[] strings) {
        return join(separator, strings, 0, strings.length);
    }

    /**
     * join a set of strings, using the separator provided, from index start to index stop
     *
     * @param separator the separator to use
     * @param strings   the list of strings
     * @param start     the start position (index in the list)0
     * @param end       the end position (index in the list)
     * @return a joined string, or "" if end - start == 0
     */
    public static String join(String separator, String[] strings,
            int start, int end) {
        if ((end - start) == 0) {
            return "";
        }
        StringBuilder ret = new StringBuilder(strings[start]);
        for (int i = start + 1; i < end; ++i) {
            ret.append(separator);
            ret.append(strings[i]);
        }
        return ret.toString();
    }
}

Related

1. join(String separator, Collection items)
2. join(String separator, Collection objs)
3. join(String separator, Collection list)
4. join(String separator, Collection parts)
5. join(String separator, Collection strings)
6. join(String separator, Collection values)
7. join(String token, Collection strings)
8. join(String[] collection, String delimiter)
9. join(String[] collection, String separator)