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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.qualframework.util;

/** {@link ExtendedTypeMirror} variant for {@link javax.lang.model.type.WildcardType}. */
public interface ExtendedWildcardType extends ExtendedTypeMirror {
    /**
     * Returns the upper bound of this wildcard.  Unlike
     * WildcardType.getExtendsBound, if no upper bound is
     * explicitly declared, a {@link ExtendedTypeMirror} representing
     * java.lang.Object is returned.
     */
    ExtendedTypeMirror getExtendsBound();

    /**
     * Returns the lower bound of this wildcard.  Unlike
     * WildcardType.getSuperBound, if no lower
     * bound is explicitly declared, a {@link ExtendedTypeMirror} representing
     * the type of null is returned.
     */
    ExtendedTypeMirror getSuperBound();
}