Here you can find the source of internalJoin(String sep, Collection
private static String internalJoin(String sep, Collection<Object> pieces)
//package com.java2s; /*/*w w w . j a va 2 s .c o m*/ * Copyright (C) 2011 The Android Open Source Project * * 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.Collection; import java.util.Iterator; public class Main { private static String internalJoin(String sep, Collection<Object> pieces) { StringBuilder sb = new StringBuilder(); boolean skipSep = true; Iterator<Object> iter = pieces.iterator(); while (iter.hasNext()) { if (skipSep) { skipSep = false; } else { sb.append(sep); } Object obj = iter.next(); if (obj == null) { sb.append("null"); } else { sb.append(obj.toString()); } } return sb.toString(); } }