类 类 之前已讲过，Scala 是一个面向对象语言，因此它有着类的概念 (更精确的说，的确有一些面向对象语言没有类的概念，但是 Scala 不是其中之一）。Scala 声明类的语法跟 Java 很接近。一个重要的差别是，Scala 的类可以有参数。如下面展示的复数的定义： class Complex ( real : Double , i...

Data Types & Serialization Supported Data Types Tuples and Case Classes POJOs Primitive Types General Class Types Values Hadoop Writables Special Types Type Erasure & Type I...

数据类型以及序列化 Supported Data Types Tuples and Case Classes POJOs Primitive Types General Class Types Values Hadoop Writables Special Types Type Erasure & Type Inference Type ...

Data Types & Serialization Supported Data Types Tuples and Case Classes POJOs Primitive Types General Class Types Values Hadoop Writables Special Types Type Erasure & Type I...

Data Types & Serialization Supported Data Types Tuples and Case Classes POJOs Primitive Types General Class Types Values Hadoop Writables Special Types Type Erasure & Type I...

Data Types Data Type Data Types in the Table API Physical Hints List of Data Types Character Strings CHAR VARCHAR / STRING Binary Strings BINARY VARBINARY / BYTES Ex...

ALTER Statements Run an ALTER statement ALTER TABLE ALTER VIEW ALTER DATABASE ALTER FUNCTION ALTER Statements ALTER statements are used to modified a registered table/view/...

Data Types & Serialization Supported Data Types Tuples and Case Classes POJOs Primitive Types General Class Types Values Hadoop Writables Special Types Type Erasure & Type I...

Project Configuration Flink Core and Application Dependencies Setting up a Project: Basic Dependencies Adding Connector and Library Dependencies Scala Versions Hadoop Dependenc...

方法可以具有 隐式 参数列表，由参数列表开头的 implicit 关键字标记。 如果参数列表中的参数没有像往常一样传递， Scala 将查看它是否可以获得正确类型的隐式值，如果可以，则自动传递。 Scala 将查找这些参数的位置分为两类： Scala 在调用包含有隐式参数块的方法时，将首先查找可以直接访问的隐式定义和隐式参数 (无前缀)。 然后，它在...