Java tutorial
//package com.java2s; /* * Copyright 2014 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; public class Main { private static <T> String formatCollection(Collection<T> collection, int maxLen) { StringBuilder builder = new StringBuilder(); builder.append("["); boolean first = true; for (T elem : collection) { String val = ((first) ? ", " : "") + ((elem != null) ? elem.toString() : "null"); first = false; if ((builder.length() + val.length()) > maxLen - "...]".length()) { builder.append("..."); break; } else { builder.append(val); } } builder.append("]"); return builder.toString(); } }