public class googleTestClass extends Methods{

@Test
public void executeGoogle() throws InterruptedException {
    googleTestClass object;
    object = new googleTestClass();
    object.goToURL("https://www.google.com");
    object.enterValue("name","q","google test 1");
}

@Test
public void test1() throws InterruptedException {

    googleTestClass object1;
    object1 = new googleTestClass();
    object1.launchBrowser();
    object1.executeGoogle();
}

@Test
public void test2() throws InterruptedException {

    googleTestClass object2;
    object2 = new googleTestClass();
    object2.launchBrowser();
    object2.executeGoogle();
}
}

// import statements

public class Methods {

public WebDriver driver;

public void launchBrowser() {

     System.setProperty("webdriver.chrome.driver","C:\chromedriver_win32\chromedriver.exe");
    System.setProperty("webdriver.chrome.args", "--disable-logging");
    System.setProperty("webdriver.chrome.silentOutput", "true");
    driver = new ChromeDriver();
}

public void goToURL(String url) {
    driver.get(url);
}

    public void enterValue(String htmltype, String identifier, String value) throws InterruptedException {
    if (htmltype == "id") {
        WebElement element = driver.findElement(By.id(identifier));
        element.clear();
        element.sendKeys(value);
        element.submit();
    }
    if (htmltype =="name") {
        WebElement element = driver.findElement(By.name(identifier));
        element.clear();
        element.sendKeys(value);
        element.submit();
    }

    Thread.sleep(3000);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite" parallel="methods">

  <test thread-count="5" name="Test" parallel="methods">
    <classes>
         <class name="webDrivertests.googleTestClass">
            <methods>
                <include name ="test1"/>
                <include name ="test2"/>
            </methods>
        </class>
    </classes>
  </test> <!-- Test -->
</suite> <!-- Suite -->