Join a collection of strings by a seperator : String « Date Type « Android

Join a collection of strings by a seperator

 * Copyright (C) 2009 Teleca Poland Sp. z o.o. <>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
import java.util.Collection;
import java.util.Iterator;

class Main{
     * Join a collection of strings by a seperator
     * @param strings collection of string objects
     * @param sep string to place between strings
     * @return joined string
    public static String join(Collection strings, String sep) {
        return join(strings.iterator(), sep);

     * Join a collection of strings by a seperator
     * @param strings iterator of string objects
     * @param sep string to place between strings
     * @return joined string
    public static String join(Iterator strings, String sep) {
        if (!strings.hasNext())
            return "";

        String start =;
        if (!strings.hasNext()) // only one, avoid builder
            return start;

        StringBuilder sb = new StringBuilder(64).append(start);
        while (strings.hasNext()) {
        return sb.toString();



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