import io.cucumber.java.en.When

It looks like you're working with Cucumber, a tool for behavior-driven development (BDD) in software projects, using the Java programming language. The `@When` annotation is part of Cucumber's step definitions that allow you to define actions that occur in response to trigger phrases in your feature files.

Here's a simple example to illustrate how you can use the `@When` annotation with Cucumber in a Java context.

### 1. Feature File

First, you need a feature file with scenarios written in Gherkin syntax. Save this as `example.feature`.

```gherkin
Feature: User Login

  Scenario: Successful login with valid credentials
    Given the user is on the login page
    When the user enters valid credentials
    Then the user should be redirected to the dashboard
```

### 2. Step Definitions

Next, you create a Java class that will contain the step definitions corresponding to the steps in your feature file.

```java
import io.cucumber.java.en.Given;
import io.cucumber.java.en.When;
import io.cucumber.java.en.Then;

import static org.junit.Assert.assertTrue;

public class LoginSteps {

    @Given("the user is on the login page")
    public void theUserIsOnTheLoginPage() {
        // Code to navigate to login page
        System.out.println("User is on the login page.");
    }

    @When("the user enters valid credentials")
    public void theUserEntersValidCredentials() {
        // Code to simulate entering valid login credentials
        System.out.println("User enters valid credentials.");
    }

    @Then("the user should be redirected to the dashboard")
    public void theUserShouldBeRedirectedToTheDashboard() {
        // Code to verify the user is on the dashboard
        assertTrue("User is not on dashboard!", isUserOnDashboard());
        System.out.println("User is redirected to the dashboard.");
    }

    // Mock method to simulate user redirection
    private boolean isUserOnDashboard() {
        // This should return true if the user is on the dashboard
        return true; // For the sake of example
    }
}
```

### 3. Running the Tests

To run the tests using Cucumber with JUnit or another testing framework, you would usually set up a runner class. Here's an example:

```java
import org.junit.runner.RunWith;
import io.cucumber.junit.Cucumber;
import io.cucumber.junit.CucumberOptions;

@RunWith(Cucumber.class)
@CucumberOptions(features = "classpath:features", glue = "your.package.name")
public class RunCucumberTest {
}
```

### Summary

The `@When` annotation is used to specify the actions that take place when a certain condition in your feature file is met. In this example, the condition is "the user enters valid credentials," which triggers the corresponding step definition in your Java code. Ensure your project is correctly set up to include the necessary Cucumber dependencies in your build management tool (like Maven or Gradle).