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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.
package org.checkerframework.common.value.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;
/**
* An annotation indicating the possible values for a String type.
* If an expression's type has this annotation, then at run time, the
* expression evaluates to one of the annotation's arguments.
*
* @checker_framework.manual #constant-value-checker Constant Value Checker
*/
@SubtypeOf({ UnknownVal.class })
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE_PARAMETER, ElementType.TYPE_USE })
public @interface StringVal {
String[] value();
}