Question

I have a Java method with a switch statement.

It’s working fine, but I have a lot of cases, perhaps 20 or more, as shown below.

switch (result)  // result is of type Enum
{
    case 1:
        break;

    case 2:
        break;

    //----
    //----
    //----

    default:
        break;
}  // End of Switch 

Please let me know how to shift these cases into another file.

Answer 1

No, Java does not have an #include facility like C does.

You’re better off simply refactoring your logic. The fact that you’re asking at all tells me you may well need some better abstractions.

But, at a minimum you could do:

public class HandleCases {

    public static Result handleCase1(...parameters...) {
        ...
    }

    public static Result handleCase2(...parameters...) {
        ...
    }

    public static Result handleCase3(...parameters...) {
        ...
    }
}

and then:

Result r = null;

switch(flag) {

    case 1:
        r = HandleCases.handleCase1( ... );
        break;

    case 2:
        r = HandleCases.handleCase1( ... );
        break;

    case 3:
        r = HandleCases.handleCase1( ... );
        break;
    ...
 }

The Result holder is where you can get back any values you need.

But overall this is a patchwork, your design could probably use some work.