Can I enforce a method parameter that has a generic but in the method defined type?

Question

I have a value class with generic type:

class TestValue<T> {
    TestValue(T value) {
    }
}

And a method that expects TestValue with a specific SomeObject type:

public void setValue(TestValue<SomeObject> value) { }

Is there a way to show a compiler error when calling this method with a value that is not of SomeObject type?

eg show a compiler error when calling this with Double instead of SomeObject

TestValue t = new TestValue(1d);
setValue(t);

^^ this should show an error

It should show an error if you don't use raw types: `TestValue t = new TestValue<>(1d);` — Sweeper, Jul 15 '20 at 06:27
Possible duplicate of https://stackoverflow.com/q/2770321/5133585 — Sweeper, Jul 15 '20 at 06:27

score 0 · Accepted Answer · answered Aug 05 '20 at 10:48

0

In IntelliJ the compiler actually finds these issues, but they are shown as warnings. You can edit the inspection settings and set Java | Compiler issues | Unchecked warning to error, then it is show as error.

answered Aug 05 '20 at 10:48

tonisives

1,962
1
18
17

Can I enforce a method parameter that has a generic but in the method defined type?

1 Answers1