How to use Scala pattern matching

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Variables can also be used in pattern matching case statements. When colorNum=4, a value of 4 is passed to the number variable.

Object MathApp {def main (args: Array [String]): Unit = {val colorNum = 4 val colorStr = colorNum match {case 1 = > "red" case 2 = > "yellow" case 3 = > "green" case number = > number+ "is Unknown"} println (colorStr)}}

# # case Class

When defining a class, if you add the case keyword before the class keyword, the class is the case class

Execution result

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