Here you can find the source of listToString(List> l, String sep)
public static String listToString(List<?> l, String sep)
//package com.java2s; /*//from w w w .j a v a2 s . c om * Copyright 2016 Miroslav Jan???ek * * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Iterator; import java.util.List; public class Main { public static String listToString(List<?> l, String sep) { return iterableToString(l, sep); } public static String iterableToString(Iterable<?> collection, String sep) { StringBuilder bld = new StringBuilder(); Iterator<?> it = collection.iterator(); while (it.hasNext()) { bld.append(it.next()); if (it.hasNext()) { bld.append(sep); } } return bld.toString(); } }