@Before -> @Test -> @After; 

public class JUnit4Test {   
    @Before  
    public void before() {   
        System.out.println("@Before");   
    }   
    
    @Test  
         /**  
          *Mark your test cases with @Test annotations.   
          *You don’t need to prefix your test cases with “test”.  
          *tested class does not need to extend from “TestCase” class.  
          */  
    public void test() {   
        System.out.println("@Test");   
        assertEquals(5 + 5, 10);   
    }   
    
    @Ignore  
    @Test  
    public void testIgnore() {   
        System.out.println("@Ignore");   
    }   
    
    @Test(timeout = 50)   
    public void testTimeout() {   
        System.out.println("@Test(timeout = 50)");   
        assertEquals(5 + 5, 10);   
    }   
    
    @Test(expected = ArithmeticException.class)   
    public void testExpected() {   
        System.out.println("@Test(expected = Exception.class)");   
        throw new ArithmeticException();   
    }   
    
    @After  
    public void after() {   
        System.out.println("@After");   
    }   
    
    @BeforeClass  
    public static void beforeClass() {   
        System.out.println("@BeforeClass");   
    };   
    
    @AfterClass  
    public static void afterClass() {   
        System.out.println("@AfterClass");   
    };   
};  
 

@BeforeClass 和 @AfterClass 對於那些比較“昂貴”的資源的分配或者釋放來說是很有效的，因為他們只會在類中被執行一次。相比之下對於那些需要在每次執行之前都要初始化或者在執行之後 都需要被清理的資源來說使用@Before和@After同樣是一個比較明智的選擇。