摘要： Hello World 交互式编程 Lua 交互式编程模式可以通过命令 lua -i 或 lua 来启用： 脚本式编程 我们可以将 Lua 程序代码保持到一个以 lua 结尾的文件，并执行，该模式称为脚本式编程，如我们将如下代码存储在名为 hello.lua 的脚本文件中： 使用 lua 命令执行以 阅读全文

摘要： A HyperLogLog is a probabilistic data structure used in order to count unique things (technically this is referred to estimating the cardinality of a 阅读全文

摘要： 原文：http://commons.apache.org/proper/commons-configuration/userguide/quick_start.html Reading a properties file Configuration information is frequently 阅读全文

摘要： Operations on String that are null safe. IsEmpty/IsBlank - checks if a String is empty (判断字符串是否为空) Trim/Strip - removes leading and trailing whitespac 阅读全文

摘要： Following on/off features are defined in DeserializationConfig.Feature (Jackson 1.x) or DeserializationFeature (Jackson 2.x): ACCEPT_EMPTY_STRING_AS_N 阅读全文

摘要： Following on/off features are defined in SerializationConfig.Feature (for Jackson 1.x), or SerializationFeature (Jackson 2.x): AUTO_DETECT_FIELDS (def 阅读全文

摘要： org.apache.commons.math3.primes.Primes 是关于质数操作的工具类。 1. public static boolean isPrime(int n) 判断 n 是否为质数。 2. public static int nextPrime(int n) 返回大于 n 的 阅读全文

摘要： The Java concurrency API provides a synchronization utility that allows the interchange of data between two concurrent tasks. In more detail, the Exch 阅读全文

摘要： The Phaser class provides a method that is executed each time the phaser changes the phase. It's the onAdvance() method. It receives two parameters: t 阅读全文

摘要： One of the most complex and powerful functionalities offered by the Java concurrency API is the ability to execute concurrent-phased tasks using the P 阅读全文