<p>
By construction, an interface's type set never contains an interface type.
</p>

<pre>
// An interface representing only the type int.
interface {
	int
}

// An interface representing all types with underlying type int.
interface {
	~int
}

// An interface representing all types with underlying type int that implement the String method.
interface {
	~int
	String() string

import java.util.concurrent.ScheduledFuture;
import org.jspecify.annotations.Nullable;

/**
 * Helper interface to implement both {@link ListenableFuture} and {@link ScheduledFuture}.
 *
 * @author Anthony Zana
 * @since 15.0
 */
@GwtCompatible
public interface ListenableScheduledFuture<V extends @Nullable Object>

    }
  }

  public void testCovariantReturn() {
    new ForwardingWrapperTester().testForwarding(Sub.class, ForwardingSub::new);
  }

  interface Base {
    CharSequence getId();
  }

  interface Sub extends Base {
    @Override
    String getId();
  }

  private static final class ForwardingSub implements Sub {
    private final Sub delegate;

import org.mockito.Mock;

/**
 * Test class for DfsReferralData interface functionality
 */
@DisplayName("DfsReferralData Interface Tests")
class DfsReferralDataTest extends BaseTest {

    @Mock
    private DfsReferralData mockReferralData;

    @Test
    @DisplayName("Should define interface methods")
    void testDfsReferralDataInterface() {
        // Verify interface methods exist
        assertDoesNotThrow(() -> {

import jcifs.SmbSession;
import jcifs.SmbTransport;
import jcifs.SmbTree;

/**
 * Internal SMB session interface providing extended session management capabilities.
 * Defines methods for internal session operations and state management.
 *
 * @author mbechler
 *
 * <p>This interface is intended for internal use.</p>
 */
public interface SmbSessionInternal extends SmbSession {

    /**

import org.mockito.Mockito;

import jcifs.internal.SMBProtocolDecodingException;

/**
 * Test class for FileInformation interface and its implementations
 */
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class FileInformationTest {

    /**
     * Test that interface constants are correctly defined
     */
    @Test
    @DisplayName("Test FileInformation constants are correctly defined")

)

// sync pools
var (
	normalPool      sync.Map
	poolInitializer = func(reflectType reflect.Type) FieldNewValuePool {
		v, _ := normalPool.LoadOrStore(reflectType, &sync.Pool{
			New: func() interface{} {
				return reflect.New(reflectType).Interface()
			},
		})
		return v.(FieldNewValuePool)
	}

/**
 * Lifecycle mapping delegate component interface. Calculates project build execution plan given {@link Lifecycle} and
 * lifecycle phase. Standard lifecycles use plugin execution {@code <phase>} or mojo default lifecycle phase to
 * calculate the execution plan, but custom lifecycles can use alternative mapping strategies.
 * <p>

/**
 * Represents a disposable resource.
 * <p>
 * If there are resources that must be disposed of when the S2 container shuts down,
 * create a class that implements this interface and register it with {@link DisposableUtil}.
 * </p>
 *
 * @author koichik
 */
public interface Disposable {

    /**
     * Disposes of the resources held by this object.
     *
     */
    void dispose();

import org.codelibs.fess.mylasta.action.FessUserBean;
import org.lastaflute.web.login.credential.LoginCredential;
import org.lastaflute.web.response.ActionResponse;

/**
 * Interface for SSO (Single Sign-On) authenticator implementations.
 *
 * This interface defines the contract for SSO authentication providers that can be
 * integrated with Fess. Implementations handle specific SSO protocols like SAML,