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TypeVariable.java
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TypeVariable.java
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/*
* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.lang.model.type;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeParameterElement;
/**
* Represents a type variable.
* A type variable may be explicitly declared by a
* {@linkplain TypeParameterElement type parameter} of a
* type, method, or constructor.
* A type variable may also be declared implicitly, as by
* the capture conversion of a wildcard type argument
* (see chapter 5 of
* <cite>The Java™ Language Specification</cite>).
*
* @author Joseph D. Darcy
* @author Scott Seligman
* @author Peter von der Ahé
* @see TypeParameterElement
* @since 1.6
*/
// 类型变量
public interface TypeVariable extends ReferenceType {
/**
* Returns the element corresponding to this type variable.
*
* @return the element corresponding to this type variable
*/
// 返回与此类型变量相应的元素
Element asElement();
/**
* Returns the upper bound of this type variable.
*
* <p> If this type variable was declared with no explicit
* upper bounds, the result is {@code java.lang.Object}.
* If it was declared with multiple upper bounds,
* the result is an {@linkplain IntersectionType intersection type};
* individual bounds can be found by examining the result's
* {@linkplain IntersectionType#getBounds() bounds}.
*
* @return the upper bound of this type variable
*/
// 类型变量的上界
TypeMirror getUpperBound();
/**
* Returns the lower bound of this type variable. While a type
* parameter cannot include an explicit lower bound declaration,
* capture conversion can produce a type variable with a
* non-trivial lower bound. Type variables otherwise have a
* lower bound of {@link NullType}.
*
* @return the lower bound of this type variable
*/
// 类型变量的下界,一般为null
TypeMirror getLowerBound();
}