Java tutorial
//package com.java2s; import java.util.ArrayList; import java.util.Collection; public class Main { public static Collection<String> convertLongsToStrings(Collection<Long> longs) { if (longs != null) { Collection<String> strings = new ArrayList<String>(longs.size()); for (long longNumber : longs) { strings.add(String.valueOf(longNumber)); } return strings; } return null; } }