My complier seems to find error in this code, what might be the problem?

Question

//This is a switch expression &! statement.
String dayType = switch(day) {
case 1, 2, 3, 4, 5 -> "working day";
case 6,7 ->"weekend";
default->"No match";
};

Answer 1

Thanks Manav Roy

Answer 2

Maybe you missed to declare variable day.

Answer 3

Before declaring dayType string

Answer 4

Where should I declare the variable day Simba?