@J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIsNull_serialization() {
    Predicate<String> pre = Predicates.isNull();
    Predicate<String> post = SerializableTester.reserializeAndAssert(pre);
    assertEquals(pre.apply("foo"), post.apply("foo"));
    assertEquals(pre.apply(null), post.apply(null));
  }

  public void testNotNull_apply() {

 * </p>
 *
 * <pre>
 * import static org.codelibs.core.beans.util.BeanUtil.*;
 *
 * copyBeanToBean(srcBean, destBean);
 * </pre>
 * <p>
 * It is also possible to copy from a JavaBean to a {@link Map} or from a {@link Map} to a JavaBean.
 * </p>
 *
 * <pre>
 * copyBeanToMap(srcBean, destMap);
 * copyMapToBean(srcMap, destBean);
 * </pre>
 * <p>

        if (StringUtil.isBlank(content)) {
            return "<pre class=\"" + style + "\">" + input.replaceAll("L[0-9]+:", StringUtil.EMPTY).trim() + "</pre>";
        }
        return "<pre class=\"" + style + " linenums:" + lineNum + "\">" + content + "</pre>";
    }

    /**
     * Retrieves a localized message for the given key.
     *
     * @param key the message key

	}

	publicKey := func(priv any) any {
		switch k := priv.(type) {
		case *rsa.PrivateKey:
			return &k.PublicKey
		case *ecdsa.PrivateKey:
			return &k.PublicKey
		default:
			return nil
		}
	}

	pemBlockForKey := func(priv any) *pem.Block {
		switch k := priv.(type) {
		case *rsa.PrivateKey:

 * attributes for business methods.
 * <p>
 * For example:
 *
 * <pre>
 * &#064;Secured({ &quot;ROLE_USER&quot; })
 * public void create(Contact contact);
 *
 * &#064;Secured({ &quot;ROLE_USER&quot;, &quot;ROLE_ADMIN&quot; })
 * public void update(Contact contact);
 *
 * &#064;Secured({ &quot;ROLE_ADMIN&quot; })
 * public void delete(Contact contact);
 * </pre>
 */
@Target({ ElementType.METHOD, ElementType.TYPE })

 * then Lock B, while another thread acquires Lock B, and then Lock A:
 *
 * <pre>
 * Thread1: acquire(LockA) --X acquire(LockB)
 * Thread2: acquire(LockB) --X acquire(LockA)
 * </pre>
 *
 * <p>Neither thread will progress because each is waiting for the other. In more complex
 * applications, cycles can arise from interactions among more than 2 locks:
 *
 * <pre>
 * Thread1: acquire(LockA) --X acquire(LockB)

 * <p>
 * Usage example:
 * </p>
 *
 * <pre>
 * import static org.codelibs.core.collection.MultiIterator.*;
 *
 * List&lt;String&gt; list = ...;
 * Set&lt;String&gt; set = ...;
 * Map&lt;String, Object&gt; map = ...;
 * for (String element : iterable(list, set, map.keySet())) {
 *     ...
 * }
 * </pre>
 *
 * @author koichik
 * @param <E> the element type
 */

 * configured based on runtime conditions.
 * <p>
 * Example usage:
 * <pre>
 * public class Providers {
 *     {@literal @}Provides
 *     {@literal @}Singleton
 *     public static Configuration provideConfiguration() {
 *         return Configuration.load();
 *     }
 * }
 * </pre>
 *
 * @since 4.0.0
 */
@Target(METHOD)
@Retention(RUNTIME)
@Documented

 * This class provides a simple way to construct RequestData objects with method chaining.
 *
 * <p>Usage example:</p>
 * <pre>
 * RequestData request = RequestDataBuilder.newRequestData()
 *     .method("GET")
 *     .url("https://example.com")
 *     .weight(1.0f)
 *     .build();
 * </pre>
 *
 * <p>The builder is implemented using an inner class {@link RequestDataContext} that handles

 * which implementation should be injected when multiple candidates exist.
 * The value represents a unique identifier for the dependency.
 * <p>
 * Example usage:
 * <pre>
 * {@literal @}Inject
 * {@literal @}Named("mysql")
 * private Repository mysqlRepository;
 * </pre>
 *
 * @see Inject
 * @see Qualifier
 * @since 4.0.0
 */
@Qualifier
@Retention(RUNTIME)
@Documented
public @interface Named {
    /**