Execute a function "before each" method of the same class in java

Florian Castelain :

I have several methods in a class that require a boolean to be set to true in order to execute correctly.

I could write the if statement in each method, but it is not convenient if I or someone else wants to ad another method. I or he could forget about the check.

Is there a way in java to execute a method before each other methods (exactly like JUnit does with @BeforeEach ) in a class ?

Edit: Lots of very interesting techniques/answers/concepts proposed. I'll be in touch when I've understood them. Thanks.

Florian Castelain :

Considering my use case, it was a bit overkill to use AOP or other concepts. So I basically did a check in each functions.