Java tutorial
//package com.java2s; /* * Copyright Terracotta, Inc. * * 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. */ public class Main { /** Optimized form of: key + "=" + val */ static String mapEntryToString(Object key, Object val) { final String k, v; final int klen, vlen; final char[] chars = new char[(klen = (k = objectToString(key)).length()) + (vlen = (v = objectToString(val)).length()) + 1]; k.getChars(0, klen, chars, 0); chars[klen] = '='; v.getChars(0, vlen, chars, klen + 1); return new String(chars); } private static String objectToString(Object x) { // Extreme compatibility with StringBuilder.append(null) String s; return (x == null || (s = x.toString()) == null) ? "null" : s; } }