Java Collection Join join(Collection collection, String separator)

License

Parameter

Return

Declaration

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

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2016 Pablo Pavon-Marino.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * Contributors:/*  w w w  .j a va  2  s . c  om*/
 *     Pablo Pavon-Marino - Jose-Luis Izquierdo-Zaragoza, up to version 0.3.1
 *     Pablo Pavon-Marino - from version 0.4.0 onwards
 ******************************************************************************/

import java.util.*;

public class Main {
    /**
     * Joins the elements in an input collection using a given separator.
     *
     * @param <A> Key type
     * @param collection Input collection
     * @param separator Separator
     * @return {@code String} representation of the input {@code collection}
     */
    public static <A> String join(Collection<A> collection, String separator) {
        if (collection.isEmpty())
            return "";

        Iterator<A> it = collection.iterator();
        StringBuilder out = new StringBuilder();
        out.append(it.next());

        while (it.hasNext())
            out.append(separator).append(it.next());

        return out.toString();
    }
}

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