JUnit Annotation Type - Before

3. Annotation Type Before: 

When writing tests, it is common to find that several tests need similar object created before they can run. Annotating a public void method with @Before causes that method to be run before the Test method. The @Before methods of superclasses will be run before those of the current class.

Here is a simple example:

public class Example{

       List empty;

       @Before

        public void initialize(){

               empty = new ArrayList();

         }

         @Test public void size(){

             ...

         }

          @Test public void remove(){

             ...

        }

}