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public class: BeforeClass [javadoc | source] 
org.junit.BeforeClass

Sometimes several tests need to share computationally expensive setup (like logging into a database). While this can compromise the independence of tests, sometimes it is a necessary optimization. Annotating a public static void no-arg method with @BeforeClass causes it to be run once before any of the test methods in the class. The @BeforeClass methods of superclasses will be run before those the current class.

For example: 
public class Example {
   @BeforeClass public static void onlyOnce() {
      ...
   }
   @Test public void one() {
      ...
   }
   @Test public void two() {
      ...
   }
}