Java switch case statement is returning different type of values(different data-type) and is assigned to same variable of type var

Following is my code snippet:

Scanner sc = new Scanner(System.in);
int input = sc.nextInt();

var output = switch (input){
  case 1 -> "one";
  case 2 -> '2';
  case 3 -> 3.14;
  default -> 10;
};

System.out.println(output);

Now if I enter 1 as input, it prints "one", for 2 it prints ‘2’, for 3 it prints 3.14 and for the rest it prints 10.

Does this mean datatype of output is decided at runtime according to the return type?

>Solution :

The type of output is determined at compile time as Serializable, because that’s the closest common ancestor to all of the results.

This compiles:

Serializable x = output;

The object assigned to the variable is determined at runtime, and is String, Character, Double or Integer.