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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.reflection.qual;

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

import org.checkerframework.framework.qual.SubtypeOf;

/**
 * This represents a Class<T> object whose run-time value
 * is equal to or a subtype of one of the arguments.
 *
 * @checker_framework.manual #methodval-and-classval-checkers ClassVal Checker
 */
@SubtypeOf({ UnknownClass.class })
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE_USE, ElementType.TYPE_PARAMETER })
public @interface ClassBound {
    /** The binary name
     * of the class or classes that upper-bound the values of this Class object. */
    String[] value();
}