I am new to cucumber. I've configured the environment for cucumber with required jars. I want to test rest api with cucumber. And so first created .feature file and generated basic step definitions. 
.feature file:
Feature: Test
  Scenario: List accounts
    Given the system knows about the following details:
      | name | value |
      | unit | 01    |
      | dept | 001   |
    When the client requests accounts
    Then the response code should be 200
    And the response should contain following details:
      | name    | value   |
      | unit    | 01      |
      | dept    | 001     |
      | acctype | current |
And TestClass.java as below:
package testPackage;
import org.junit.runner.RunWith;
import cucumber.api.CucumberOptions;
import cucumber.api.DataTable;
import cucumber.api.PendingException;
import cucumber.api.java.en.*;
import cucumber.api.junit.Cucumber;
@RunWith(Cucumber.class)
@CucumberOptions(
        features={"classpath:cucumber.features/"},
        glue = {"testPackage"}      
        )
public class TestClass {
    @Given("^the system knows about the following details:$")
    public void the_system_knows_about_the_following_details(DataTable arg1) throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        // For automatic transformation, change DataTable to one of
        // List<YourType>, List<List<E>>, List<Map<K,V>> or Map<K,V>.
        // E,K,V must be a scalar (String, Integer, Date, enum etc)
        throw new PendingException();
    }
    @When("^the client requests accounts$")
    public void the_client_requests_accounts() throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        throw new PendingException();
    }
    @Then("^the response code should be (\\d+)$")
    public void the_response_code_should_be(int arg1) throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        throw new PendingException();
    }
    @Then("^the response should contain following details:$")
    public void the_response_should_contain_following_details(DataTable arg1) throws Throwable {
        // Write code here that turns the phrase above into concrete actions
        // For automatic transformation, change DataTable to one of
        // List<YourType>, List<List<E>>, List<Map<K,V>> or Map<K,V>.
        // E,K,V must be a scalar (String, Integer, Date, enum etc)
        throw new PendingException();
    }
}
I searched a lot but couldn't able to find to send GET request from .java file. 
How to send GET request from cucumber step definitions and compare json response ?
 
     
    