Java tutorial
//package com.java2s; import java.util.*; public class Main { public static String join(Object[] words, String seperator) { StringBuilder sb = new StringBuilder(); if (words != null) { for (int i = 0; i < words.length; ++i) { sb.append(words[i]); if (i < words.length - 1) { sb.append(seperator); } } } return sb.toString(); } public static String join(Collection<?> collection, String seperator) { Object[] objs = new Object[collection.size()]; collection.toArray(objs); return join(objs, seperator); } }