Explain testNG annotation in sequence with real time scenario?example of @After@Before in TestNG?selenium interview qus/testng

Explained TestNG annotations in sequence, very imp interview questions.

Execute the script and try to observe how @test @Method @Suite @Class works.

In the interview they may ask to tell how many time @test and @method will run. I have added the output after executing it to eclipse.As we have pass three pair of values in dataprovider so 3 times test script got executed.

public class NewTest {   @Test(dataProvider = "dp")   public void f(Integer n, String s) {   System.out.println(n + s);   }   @BeforeMethod   public void beforeMethod() {   System.out.println("Beforemethod:");   }   @AfterMethod   public void afterMethod() {   System.out.println("Aftermethod:");   }   @DataProvider   public Object[][] dp() {     return new Object[][] {       new Object[] { 1, "a" },       new Object[] { 2, "b" },       new Object[] { 0,"2test" }     };   }   @BeforeClass   public void beforeClass() {   System.out.println("Beforeclass:");   }   @AfterClass   public void afterClass() {   System.out.println("AfterClass");   }   @BeforeTest   public void beforeTest() {   System.out.println("BeforeTest:");   }   @AfterTest   public void afterTest() {   System.out.println("AfterTest");   }   @BeforeSuite   public void beforeSuite() {   System.out.println("BeforeSuite");   }   @AfterSuite   public void afterSuite() {   System.out.println("AfterSuite");   } }

Output:

BeforeSuite
BeforeTest:
Beforeclass:
Beforemethod:
1a
Aftermethod:
Beforemethod:
2b
Aftermethod:
Beforemethod:
02test
Aftermethod:
AfterClass
AfterTest
PASSED: f(1, "a")
PASSED: f(2, "b")
PASSED: f(0, "2test")

===============================================
    Default test
    Tests run: 3, Failures: 0, Skips: 0
===============================================

AfterSuite

===============================================
Default suite
Total tests run: 3, Failures: 0, Skips: 0
===============================================