setUp/tearDown (@Before/@After) why we need them in JUnit?

Question

I believe that we are all know that setUp (@Before) will execute before any test method and tearDown(@After) will execute after test method.

Also we know that Junit

Answer 1

I think some reason should like the following:

1. If you move @Before contents to Constructor, That's fine, but the @After contents where you get to move?
2. The differences of Constructor and @Before/@After is that Constructor should be used to instance some for class, @Before/@After is for preparing test case resources.