Java Collection Join join(Collection strings, String separator)

Description

Concatenate multiple strings by inserting a separator.

License

Open Source License

Declaration

public static String join(Collection<?> strings, String separator) 

Method Source Code

//package com.java2s;
/*//from w ww . j ava2  s  .  c o m
 * The MIT License
 *
 * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
 *
 * 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.*;

public class Main {
    /**
     * Concatenate multiple strings by inserting a separator.
     */
    public static String join(Collection<?> strings, String separator) {
        StringBuilder buf = new StringBuilder();
        boolean first = true;
        for (Object s : strings) {
            if (first)
                first = false;
            else
                buf.append(separator);
            buf.append(s);
        }
        return buf.toString();
    }

    /**
     * Combines all the given collections into a single list.
     */
    public static <T> List<T> join(Collection<? extends T>... items) {
        int size = 0;
        for (Collection<? extends T> item : items)
            size += item.size();
        List<T> r = new ArrayList<T>(size);
        for (Collection<? extends T> item : items)
            r.addAll(item);
        return r;
    }
}

Related

1. join(Collection s, String delimiter)
2. join(Collection s, String delimiter)
3. join(Collection strings, String delimiter)
4. join(Collection strings, String delimiter)
5. join(Collection strings, String separator)
6. join(Collection strings, String separator)
7. join(Collection strs)
8. join(Collection toJoin, String joinBy)
9. join(Collection tokens, String d)