Java tutorial
//package com.java2s; /* * Copyright 2007 Yusuke Yamamoto * * 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.List; public class Main { public static String join(int[] follows) { StringBuilder buf = new StringBuilder(11 * follows.length); for (int follow : follows) { if (0 != buf.length()) { buf.append(","); } buf.append(follow); } return buf.toString(); } public static String join(long[] follows) { StringBuilder buf = new StringBuilder(11 * follows.length); for (long follow : follows) { if (0 != buf.length()) { buf.append(","); } buf.append(follow); } return buf.toString(); } public static String join(String[] track) { StringBuilder buf = new StringBuilder(11 * track.length); for (String str : track) { if (0 != buf.length()) { buf.append(","); } buf.append(str); } return buf.toString(); } public static String join(List<String> strs) { StringBuilder buf = new StringBuilder(11 * strs.size()); for (String str : strs) { if (0 != buf.length()) { buf.append(","); } buf.append(str); } return buf.toString(); } }