TESTNG Execution Hierarchy| How TestNG Executes different annotations?

TestNG Execution Hierarchy

TestNG follows following execution hierarchy.

1. Suite
2. Test
3. Class
4. Method

Take a quick look at practical application of TestNG Annotation on Eclipse IDE

Examples:

Lets explore the use case in various conditions

Condition 1 >> I  want to open my chrome browser once before all the @test from a class

= In this case I will write the selenium code to open the chrome browser in @BeforeClass method

Condition 2 >> I  want to open an specific URL before each test from a class 

= In this case I will write the selenium code to open the URL in @Beforemethod