@Before and @After

@Before

This annotation is used with a method.

Method annotated with @Before annotation is executed before each and every test case method. 

This annotation is specifically used to initialise required members in a init or setup kind method.

Example:

@Before

public void init(){

/* write your common initialization code here, which need to execute before each test case execution */

}

@After

This annotation is used with a method.

Method annotated with @After annotation is executed after each and every test cased defined in a class.

This annotation is used specifically to call a method having specific releasing resources related task.

Method annotated with this annotation executed regardless of the test method throws exeception or not.

Example:

@After

public void finish(){

/* write your common resource release related code here, which need to execute after each test case execution */

}