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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 {@link java.lang.Class Class<T>} object
 * where the set of possible values of T is known at compile time.  If only
 * one argument is given, then the exact value of T is known.  If more than
 * one argument is given, then the value of T is one of those classes.
 *
 * @checker_framework.manual #methodval-and-classval-checkers ClassVal Checker
 */
@SubtypeOf({ UnknownClass.class })
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE_USE, ElementType.TYPE_PARAMETER })
public @interface ClassVal {
    /** The binary name
     * of the class that this Class object represents. */
    String[] value();
}