Explain how can we create a data-driven framework using TestNG?

Using @DataProvider we can create a data-driven framework in which data is passed to the associated test method and multiple iterations of the test run for the different test data values passed from the @DataProvider method. The method annotated with @DataProvider annotation return a 2D array of object.

//Data provider returning 2D array of 3*2 matrix
@DataProvider(name = “dataProvider1”)
public Object[][] dataProviderMethod1() {
return new Object[][] {{“kuldeep”,”rana”}, {“k1″,”r1”},{“k2″,”r2”}};
}
//This method is bound to the above data provider returning 2D array of 3*2 matrix
//The test case will run 3 times with different set of values
@Test(dataProvider = “dataProvider1”)
public void sampleTest(String s1, String s2) {
System.out.println(s1 + ” ” + s2);
}