UndefinedStepExecution error occure while running JUNIT

Question

io.cucumber.junit.UndefinedStepException: The step "user is on login page" is undefined. You can implement it using the snippet(s) below:

@Given("user is on login page")
public void user_is_on_login_page() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}

Some other steps were also undefined:

@When("user enters username and password")
public void user_enters_username_and_password() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}
@When("clicks on login button")
public void clicks_on_login_button() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}
@Then("user is navigated to the homepage")
public void user_is_navigated_to_the_homepage() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}
@When("user is clicks on welcome link")
public void user_is_clicks_on_welcome_link() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}
@Then("logout link is displayed")
public void logout_link_is_displayed() {
    // Write code here that turns the phrase above into concrete actions
    throw new io.cucumber.java.PendingException();
}