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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.framework.qual;

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

/**
 * Indicates that the annotated qualifier is the default qualifier in the qualifier hierarchy: it
 * applies if the programmer writes no explicit qualifier and no other default has been specified
 * for the location.
 *
 * 

Other defaults can be specified for a checker via the {@link DefaultFor} meta-annotation, * which takes precedence over {@code DefaultQualifierInHierarchy}, or via {@code * GenericAnnotatedTypeFactory.addCheckedCodeDefaults()}. Also, the CLIMB-to-top rule applies unless * explicitly overruled. * *

The {@link DefaultQualifier} annotation, which targets Java code elements, takes precedence * over {@code DefaultQualifierInHierarchy}. * *

Each type qualifier hierarchy may have at most one qualifier marked as {@code * DefaultQualifierInHierarchy}. * * @checker_framework.manual #effective-qualifier The effective qualifier on a type (defaults and * inference) * @checker_framework.manual #defaults Default qualifiers for unannotated types * @see org.checkerframework.framework.qual.DefaultQualifier */ @Documented @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.ANNOTATION_TYPE) public @interface DefaultQualifierInHierarchy {}





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