编辑代码

object OptionDemo{
    def main(args:Array[String]):Unit ={
        val myMap:Map[String,String] = Map("red"->"colorR");
        val value1:Option[String] = myMap.get("red");
        val value2:Option[String] = myMap.get("key");

        println(value1);
        println(value2);
    }
}