When I try to run my code, it only shows cucumber skeleton. I use a JUnit runner class as JUnit test suite.
Code is below for all three classes.
Feature is :
Feature: Check addition in Google calculator
   In order to verify that google calculator work correctly
   As a user of google
   I should be able to get correct addition result
@Runme
   Scenario: Addition
   Given I open google
   When I enter "2+2" in search textbox
   Then I should get result as "4"
Selenium Class :
package cucumberTest;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class SeleniumTest {
    private SeleniumTest()
    {
    }
        private static WebDriver driver = null;
    public static void seleniumTest() {
        // Create a new instance of the Firefox driver
        driver = new FirefoxDriver();
        //Put a Implicit wait, this means that any search for elements on the page could take the time the implicit wait is set for before throwing exception
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        //Launch the Online Store Website
        driver.get("http://www.store.demoqa.com");
        // Find the element that's ID attribute is 'account'(My Account) 
        driver.findElement(By.xpath(".//*[@id='account']/a")).click();
        // Find the element that's ID attribute is 'log' (Username)
        // Enter Username on the element found by above desc.
        driver.findElement(By.id("log")).sendKeys("testuser_1"); 
        // Find the element that's ID attribute is 'pwd' (Password)
        // Enter Password on the element found by the above desc.
        driver.findElement(By.id("pwd")).sendKeys("Test@123");
        // Now submit the form. WebDriver will find the form for us from the element 
        driver.findElement(By.id("login")).click();
        // Print a Log In message to the screen
        System.out.println("Login Successfully");
        // Find the element that's ID attribute is 'account_logout' (Log Out)
        driver.findElement (By.xpath(".//*[@id='account_logout']/a")).click();
        // Print a Log In message to the screen
        System.out.println("LogOut Successfully");
        // Close the driver
        driver.quit();
    }
}
JUnit Class:
package cucumberTest;
import org.junit.runner.RunWith;
import cucumber.api.CucumberOptions;
import cucumber.api.junit.Cucumber;
@RunWith(Cucumber.class)
//@CucumberOptions(
    //  features = "Feature/googleCalc.feature"
        ////,glue={"stepDefinition"}
    //  )
@CucumberOptions(
features = {"Feature/googleCalc.feature"},glue={"stepDefinition"},
plugin = {"pretty"},
tags = {"@Runme"}
)
public class TestRunner {
}
Step Definitions :
package stepDefination;
import java.util.concurrent.TimeUnit;
import org.junit.Assert;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.By;
import cucumber.api.java.After;
import cucumber.api.java.Before;
import cucumber.api.java.en.Given;
import cucumber.api.java.en.Then;
import cucumber.api.java.en.When;
import cucumberTest.SeleniumTest;
public class googleCalcStepDefinition {
    @Given("^I open google$")
    public void i_open_google() throws Throwable {
        // Write code here that turns the phrase above into concrete actions
      SeleniumTest.seleniumTest();
    }
    @When("^I enter \"(.*?)\" in search textbox$")
    public void i_enter_in_search_textbox(String arg1) throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        SeleniumTest.seleniumTest();
    }
    @Then("^I should get result as \"(.*?)\"$")
    public void i_should_get_result_as(String arg1) throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        SeleniumTest.seleniumTest();
    }
}
Output shown is :
Feature: Check addition in Google calculator
   In order to verify that google calculator work correctly
   As a user of google
   I should be able to get correct addition result
  @Runme
  Scenario: Addition                     [90m# Feature/googleCalc.feature:7[0m
    [33mGiven [0m[33mI open google[0m
    [33mWhen [0m[33mI enter "2+2" in search textbox[0m
    [33mThen [0m[33mI should get result as "4"[0m
1 Scenarios ([33m1 undefined[0m)
3 Steps ([33m3 undefined[0m)
0m0.000s
You can implement missing steps with the snippets below:
@Given("^I open google$")
public void i_open_google() throws Throwable {
    // Write code here that turns the phrase above into concrete actions
    throw new PendingException();
}
@When("^I enter \"(.*?)\" in search textbox$")
public void i_enter_in_search_textbox(String arg1) throws Throwable {
    // Write code here that turns the phrase above into concrete actions
    throw new PendingException();
}
@Then("^I should get result as \"(.*?)\"$")
public void i_should_get_result_as(String arg1) throws Throwable {
    // Write code here that turns the phrase above into concrete actions
    throw new PendingException();
}
 
    