https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 *
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package javax.swing;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;


An annotation used to specify some swing-related information for the automatically generated BeanInfo classes. This annotation is not used if the annotated class has a corresponding user-defined BeanInfo class, which does not imply the automatic analysis. 
 The isContainer 
feature attribute was introduced primarily for the Swing library. All Swing components extend the Container class by design, so the builder tool assumes that all Swing components are containers. The BeanInfo classes with the isContainer attribute allow to directly specify whether a Swing component is a container or not. 
Author:Sergey A. Malenkov
Since:9
/**
 * An annotation used to specify some swing-related information
 * for the automatically generated {@code BeanInfo} classes.
 * This annotation is not used if the annotated class
 * has a corresponding user-defined {@code BeanInfo} class,
 * which does not imply the automatic analysis.
 * <p>
 * The {@code isContainer} {@link java.beans.BeanDescriptor#getValue
 * feature attribute} was introduced primarily for the Swing library.
 * All Swing components extend the {@link java.awt.Container Container}
 * class by design, so the builder tool assumes that all Swing components
 * are containers.  The {@link java.beans.BeanInfo BeanInfo} classes
 * with the {@code isContainer} attribute allow to directly specify
 * whether a Swing component is a container or not.
 *
 * @since 9
 *
 * @author Sergey A. Malenkov
 */
@Target({TYPE})
@Retention(RUNTIME)
public @interface SwingContainer {
    
The value that indicates whether the annotated class can be used
as a container for other Swing components or not.

Returns:true if the annotated class is a Swing container; false otherwise.
/**
     * The value that indicates whether the annotated class can be used
     * as a container for other Swing components or not.
     *
     * @return {@code true} if the annotated class is a Swing container;
     *         {@code false} otherwise.
     */
    boolean value() default true;

    
The name of the getter method in the annotated class,
which returns the corresponding Swing container,
if it is not recommended to add subcomponents
to the annotated class directly.

Returns:the name of the getter method in the annotated class,
        which returns the corresponding Swing container,
        or an empty string if the method name is not set.
/**
     * The name of the getter method in the annotated class,
     * which returns the corresponding Swing container,
     * if it is not recommended to add subcomponents
     * to the annotated class directly.
     *
     * @return the name of the getter method in the annotated class,
     *         which returns the corresponding Swing container,
     *         or an empty string if the method name is not set.
     */
    String delegate() default "";
}