Scala - Optional Arguments without requiring user to input Some(…)
来源： https://stackoverflow.com/questions/62350998/scala-optional-arguments-without-requiring-user-to-input-some
scala
Error: Could not find or load main class io.gatling.app.Gatling
来源： https://stackoverflow.com/questions/63830435/error-could-not-find-or-load-main-class-io-gatling-app-gatling
Scala 2.8馆藏图书馆是“历史上最长的遗书”吗？ [关闭]
问题： I have just started to look at the Scala collections library re-implementation which is coming in the imminent 2.8 release. 我刚刚开始研究即将发布的 2.8 版本中的 Scala集合库重新实现 。 Those familiar with the library from 2.7 will notice that the library, from a usage perspective, has changed little. 熟悉2.7中的库的人会注意到，从使用角度来看，库几乎没有变化。 For example... 例如... > List("Paris", "London").map(_.length) res0: List[Int] List(5, 6) ...would work in either versions. ......适用于任何一个版本。 The library is eminently useable : in fact it's fantastic. 图书馆非常实用 ：实际上它太棒了。 However, those previously unfamiliar with Scala and poking around to
大数据课设笔记2：Win10 Spark集群本地开发环境搭建
Win10 Spark集群本地开发环境搭建 一、安装Java 1.下载java 2.安装java 3.配置环境变量 二、安装scala 1.下载scala 2.安装scala 3.配置scala环境变量 4.验证安装 三、安装Hadoop 1.下载hadoop2.7.7 2.解压hadoop 3.配置hadoop环境变量 4.验证安装 5.配置hadoop插件 四、安装maven 五、安装Scala IDE 1.下载Scala IDE 2.解压zip包 3.配置maven工程 六、利用maven创建Spark工程并使用scala编程 1.创建工程 2.编写一个单词计数程序 这里附上WIN10 利用docker toolbox搭建hadoop和spark集群 的方法 一、安装Java 1.下载java jdk1.8下载链接 2.安装java Win：双击可执行文件 Linux：解压压缩包 3.配置环境变量 请参考 菜鸟教程 ，这里不多介绍。 二、安装scala 注意：该步骤非必须，如果使用Scala IDE自带的scala可以直接跳过 1.下载scala 传送门 2.安装scala 将压缩包找一个目录解压 3.配置scala环境变量 在系统变量中添加SCALA_HOME及安装目录，在PATH里添加% %SCALA_HOME%\bin 4.验证安装 powershell里输入命令
Accept a list of table names and col name in scala and return appended prefix on column values
来源： https://stackoverflow.com/questions/63519289/accept-a-list-of-table-names-and-col-name-in-scala-and-return-appended-prefix-on
Difference of Upper Bounded Type and normal class behavior
来源： https://stackoverflow.com/questions/61852217/difference-of-upper-bounded-type-and-normal-class-behavior
Difference of Upper Bounded Type and normal class behavior
来源： https://stackoverflow.com/questions/61852217/difference-of-upper-bounded-type-and-normal-class-behavior
py4j.protocol.Py4JJavaError: An error occurred while calling o59.save. : java.lang.NoClassDefFoundError: scala/runtime/LazyBoolean
来源： https://stackoverflow.com/questions/60120705/py4j-protocol-py4jjavaerror-an-error-occurred-while-calling-o59-save-java-la
How can I automatically map JSON to a case class when a field is a scala keyword?
来源： https://stackoverflow.com/questions/46574574/how-can-i-automatically-map-json-to-a-case-class-when-a-field-is-a-scala-keyword
How can I automatically map JSON to a case class when a field is a scala keyword?
来源： https://stackoverflow.com/questions/46574574/how-can-i-automatically-map-json-to-a-case-class-when-a-field-is-a-scala-keyword