uTools-Manuals/docs/java/javax/lang/model/util/ElementKindVisitor8.html

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     javax.lang.model.util 
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<h2 class="title" title="Class ElementKindVisitor8">Class ElementKindVisitor8&lt;R,P&gt;</h2>
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<ul class="inheritance">
<li><a href="../../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<ul class="inheritance">
<li><a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html" title="class in javax.lang.model.util">javax.lang.model.util.AbstractElementVisitor6</a>&lt;R,P&gt;</li>
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<ul class="inheritance">
<li><a href="../../../../javax/lang/model/util/SimpleElementVisitor6.html" title="class in javax.lang.model.util">javax.lang.model.util.SimpleElementVisitor6</a>&lt;R,P&gt;</li>
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<ul class="inheritance">
<li><a href="../../../../javax/lang/model/util/ElementKindVisitor6.html" title="class in javax.lang.model.util">javax.lang.model.util.ElementKindVisitor6</a>&lt;R,P&gt;</li>
<li>
<ul class="inheritance">
<li><a href="../../../../javax/lang/model/util/ElementKindVisitor7.html" title="class in javax.lang.model.util">javax.lang.model.util.ElementKindVisitor7</a>&lt;R,P&gt;</li>
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<li>javax.lang.model.util.ElementKindVisitor8&lt;R,P&gt;</li>
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<span class="paramLabel">参数类型</span>
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<span><code>R</code> - 这个访问者的方法的返回类型。</span>
<span>对不需要返回结果的访问者使用<a href="../../../../java/lang/Void.html" title="java.lang中的类"><code>Void</code></a> 。</span>
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<span><code>P</code> - 访问者方法的附加参数类型。</span>
<span>对不需要<code>Void</code>的访问者使用Void。</span>
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         All Implemented Interfaces: 
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<dd>
<span><a href="../../../../javax/lang/model/element/ElementVisitor.html" title="javax.lang.model.element中的接口">ElementVisitor</a> &lt;R，P&gt;</span>
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<hr/> <br/> <pre><a href="../../../../javax/annotation/processing/SupportedSourceVersion.html" title="annotation in javax.annotation.processing">@SupportedSourceVersion</a>(<a href="../../../../javax/annotation/processing/SupportedSourceVersion.html#value--">value</a>=<a href="../../../../javax/lang/model/SourceVersion.html#RELEASE_8">RELEASE_8</a>)
public class <span class="typeNameLabel">ElementKindVisitor8&lt;R,P&gt;</span>
extends <a href="../../../../javax/lang/model/util/ElementKindVisitor7.html" title="class in javax.lang.model.util">ElementKindVisitor7</a>&lt;R,P&gt;</pre>
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<span>程序元素的访问者基于他们的<a href="../../../../javax/lang/model/element/ElementKind.html" title="javax.lang.model.element中的枚举">kind</a> ，默认行为适用于<a href="../../../../javax/lang/model/SourceVersion.html#RELEASE_8"><code>RELEASE_8</code></a>源版本。</span>
<span>对于可能有多种类型的<a href="../../../../javax/lang/model/element/Element.html" title="javax.lang.model.element中的接口">elements</a> <tt><i>XYZ</i></tt> ，此类中的<tt>visit<i>XYZ</i></tt>方法委托给对应于第一个参数类型的<tt>visit<i>XYZKind</i></tt>方法。</span>
<span><tt>visit<i>XYZKind</i></tt>方法调用<a href="../../../../javax/lang/model/util/SimpleElementVisitor6.html#defaultAction-javax.lang.model.element.Element-P-"><code>defaultAction</code></a> ，将其参数传递给<code>defaultAction</code>的相应参数。</span>
<p> <span>本课程中的方法可能会因其总体合同而被覆盖。</span> <span>需要注意的是注释方法，具体子类与<a href="../../../../java/lang/Override.html" title="java.lang中的注释"><code>@Override</code></a>将有助于确定那些打算重写的方法。</span> </p>
<p> <span><b>警告：</b>由此<code>ElementVisitor</code>实现的ElementVisitor接口可能添加了方法，或者在这种情况下使用的<code>ElementKind</code> <code>枚举</code>可能会在将来添加常量以适应未来版本的Java的“新的，当前未知的”语言结构编程语言</span> <span>因此， <code>"visit"</code>可以将名称以<code>"visit"</code>开头的方法添加到此类中;</span> <span>为了避免不兼容，扩展此类的类不应声明任何以<code>"visit"</code>实例方法。</span> </p>
<p> <span>当添加这种新的访问方法时，此类中的默认实现将是调用<a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html#visitUnknown-javax.lang.model.element.Element-P-"><code>visitUnknown</code></a>方法。</span> <span>还将引入一个新的抽象元素类访客类，以对应于新的语言级别;</span> <span>该访问者对于访问方法将具有不同的默认行为。</span> <span>当新访客被介绍时，全部或部分访问者可能会被弃用。</span> </p>
<p> <span>请注意，在访问者类中添加新的访问方法的默认实现将发生，而不是直接在访问者界面中添加<em>默认方法</em> ，因为Java SE 8语言功能不能用于此版本的API，因为此版本需要可以在Java SE 7实现中运行。</span> <span>仅在Java SE 8及更高版本上运行的API的未来版本可能会在这种情况下利用默认方法。</span> </p>
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<span class="simpleTagLabel">从以下版本开始：</span>
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         1.8 
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<dt>
<span class="seeLabel">另请参见：</span>
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<dd>
<span><a href="../../../../javax/lang/model/util/ElementKindVisitor6.html" title="javax.lang.model.util中的类"><code>ElementKindVisitor6</code></a> ， <a href="../../../../javax/lang/model/util/ElementKindVisitor7.html" title="javax.lang.model.util中的类"><code>ElementKindVisitor7</code></a></span>
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<span>构造方法</span>
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<th class="colFirst" scope="col">Modifier</th>
<th class="colLast" scope="col">Constructor and Description</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/lang/model/util/ElementKindVisitor8.html#ElementKindVisitor8--">ElementKindVisitor8</a></span>()</code>
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<span>具体子类的构造方法</span>
<span>使用<code>null</code>作为默认值。</span>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/lang/model/util/ElementKindVisitor8.html#ElementKindVisitor8-R-">ElementKindVisitor8</a></span>(<a href="../../../../javax/lang/model/util/ElementKindVisitor8.html" title="type parameter in ElementKindVisitor8">R</a> defaultValue)</code>
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<span>具体子类的构造方法</span>
<span>使用参数作为默认值。</span>
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<li class="blockList"> <h4>ElementKindVisitor8</h4> <pre>protected ElementKindVisitor8()</pre>
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<span>具体子类的构造方法</span>
<span>使用<code>null</code>作为默认值。</span>
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<li class="blockList"> <h4>ElementKindVisitor8</h4> <pre>protected ElementKindVisitor8(<a href="../../../../javax/lang/model/util/ElementKindVisitor8.html" title="type parameter in ElementKindVisitor8">R</a> defaultValue)</pre>
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<span>具体子类的构造方法</span>
<span>使用参数作为默认值。</span>
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<span class="paramLabel">参数</span>
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<code>defaultValue</code> - 分配给 
            <a href="../../../../javax/lang/model/util/SimpleElementVisitor6.html#DEFAULT_VALUE"><code>SimpleElementVisitor6.DEFAULT_VALUE</code></a>的值 
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