Java: Is it possible to always execute a certain function before other functions are called? (Like @Before in JUnit)

Question

Is there a way to always execute a function before any other function of a class is called?

I have a class where I need to refresh some fields always before any func

Answer 1

Not in Java SE, but if you are using Java EE, you could use interceptors.

For standalone applications, you could consider using a bytecode manipulation framework, like javassist.