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553 lines
26 KiB
HTML
<div class="header">
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<div class="subTitle">
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compact3
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</div>
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<div class="subTitle">
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javax.management
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</div>
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<h2 class="title" title="Class MBeanAttributeInfo">Class MBeanAttributeInfo</h2>
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</div><div class="contentContainer">
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<ul class="inheritance">
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<li><a href="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li>
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<ul class="inheritance">
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<li><a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">javax.management.MBeanFeatureInfo</a></li>
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<li>
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<ul class="inheritance">
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<li>javax.management.MBeanAttributeInfo</li>
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</ul> </li>
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</ul> </li>
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</ul>
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<div class="description">
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<ul class="blockList">
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<li class="blockList">
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<dl>
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<dt>
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All Implemented Interfaces:
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</dt>
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<dd>
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<span><a href="../../java/io/Serializable.html" title="java.io中的接口">Serializable</a> ， <a href="../../java/lang/Cloneable.html" title="java.lang中的接口">Cloneable</a> ， <a href="../../javax/management/DescriptorRead.html" title="javax.management中的接口">DescriptorRead</a></span>
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</dd>
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</dl>
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<dl>
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<dt>
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已知直接子类：
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</dt>
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<dd>
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<span><a href="../../javax/management/modelmbean/ModelMBeanAttributeInfo.html" title="javax.management.modelmbean中的类">ModelMBeanAttributeInfo</a> ， <a href="../../javax/management/openmbean/OpenMBeanAttributeInfoSupport.html" title="javax.management.openmbean中的类">OpenMBeanAttributeInfoSupport</a></span>
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</dd>
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</dl>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">MBeanAttributeInfo</span>
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extends <a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">MBeanFeatureInfo</a>
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implements <a href="../../java/lang/Cloneable.html" title="interface in java.lang">Cloneable</a></pre>
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<div class="block">
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<span>描述为管理而公开的MBean属性。</span>
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<span>这个类的实例是不可变的。</span>
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<span>子类可能是可变的，但不建议这样做。</span>
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</div>
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<dl>
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<dt>
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<span class="simpleTagLabel">从以下版本开始：</span>
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</dt>
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<dd>
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1.5
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</dd>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<a href="../../serialized-form.html#javax.management.MBeanAttributeInfo">Serialized Form</a>
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</dd>
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</dl> </li>
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</ul>
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</div>
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<div class="summary">
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<!-- =========== FIELD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="field.summary">
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<!-- --> </a> <h3>Field Summary</h3>
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<ul class="blockList">
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<li class="blockList"><a name="fields.inherited.from.class.javax.management.MBeanFeatureInfo">
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<!-- --> </a> <h3>Fields inherited from class javax.management.<a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">MBeanFeatureInfo</a></h3> <code><a href="../../javax/management/MBeanFeatureInfo.html#description">description</a>, <a href="../../javax/management/MBeanFeatureInfo.html#name">name</a></code></li>
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</ul> </li>
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</ul>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.summary">
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<!-- --> </a> <h3>构造方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption>
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<span>构造方法</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colOne" scope="col">Constructor and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.reflect.Method-java.lang.reflect.Method-">MBeanAttributeInfo</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name, <a href="../../java/lang/String.html" title="class in java.lang">String</a> description, <a href="../../java/lang/reflect/Method.html" title="class in java.lang.reflect">方法</a> getter, <a href="../../java/lang/reflect/Method.html" title="class in java.lang.reflect">方法</a> setter)</code>
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<div class="block">
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该构造函数使用简单属性的名称，以及用于读取和写入属性的Method对象。
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.String-boolean-boolean-boolean-">MBeanAttributeInfo</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name, <a href="../../java/lang/String.html" title="class in java.lang">String</a> type, <a href="../../java/lang/String.html" title="class in java.lang">String</a> description, boolean isReadable, boolean isWritable, boolean isIs)</code>
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<div class="block">
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构造一个
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<code>MBeanAttributeInfo</code>对象。
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</div> </td>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.String-boolean-boolean-boolean-javax.management.Descriptor-">MBeanAttributeInfo</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name, <a href="../../java/lang/String.html" title="class in java.lang">String</a> type, <a href="../../java/lang/String.html" title="class in java.lang">String</a> description, boolean isReadable, boolean isWritable, boolean isIs, <a href="../../javax/management/Descriptor.html" title="interface in javax.management">Descriptor</a> descriptor)</code>
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<div class="block">
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构造一个
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<code>MBeanAttributeInfo</code>对象。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.summary">
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<!-- --> </a> <h3>方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr class="altColor" id="i0">
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<td class="colFirst"><code><a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#clone--">clone</a></span>()</code>
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<div class="block">
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返回此实例的浅克隆。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i1">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#equals-java.lang.Object-">equals</a></span>(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> o)</code>
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<div class="block">
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将此MBeanAttributeInfo与另一个进行比较。
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</div> </td>
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</tr>
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<tr class="altColor" id="i2">
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<td class="colFirst"><code><a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#getType--">getType</a></span>()</code>
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<div class="block">
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返回属性的类名。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i3">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#hashCode--">hashCode</a></span>()</code>
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<div class="block">
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返回对象的哈希码值。
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</div> </td>
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</tr>
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<tr class="altColor" id="i4">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#isIs--">isIs</a></span>()</code>
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<div class="block">
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表示此属性是否为“是”吸气剂。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i5">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#isReadable--">isReadable</a></span>()</code>
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<div class="block">
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是否可以读取属性的值。
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</div> </td>
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</tr>
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<tr class="altColor" id="i6">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#isWritable--">isWritable</a></span>()</code>
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<div class="block">
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是否可以将新值写入属性。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i7">
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<td class="colFirst"><code><a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/management/MBeanAttributeInfo.html#toString--">toString</a></span>()</code>
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<div class="block">
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返回对象的字符串表示形式。
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</div> </td>
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</tr>
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</tbody>
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</table>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.javax.management.MBeanFeatureInfo">
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<!-- --> </a> <h3>Methods inherited from class javax.management.<a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">MBeanFeatureInfo</a></h3> <code><a href="../../javax/management/MBeanFeatureInfo.html#getDescription--">getDescription</a>, <a href="../../javax/management/MBeanFeatureInfo.html#getDescriptor--">getDescriptor</a>, <a href="../../javax/management/MBeanFeatureInfo.html#getName--">getName</a></code></li>
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</ul>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- --> </a> <h3>Methods inherited from class java.lang.<a href="../../java/lang/Object.html" title="class in java.lang">Object</a></h3> <code><a href="../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../java/lang/Object.html#notify--">notify</a>, <a href="../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../java/lang/Object.html#wait--">wait</a>, <a href="../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.detail">
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<!-- --> </a> <h3>构造方法详细信息</h3> <a name="MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.String-boolean-boolean-boolean-">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>MBeanAttributeInfo</h4> <pre>public MBeanAttributeInfo(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name,
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<a href="../../java/lang/String.html" title="class in java.lang">String</a> type,
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<a href="../../java/lang/String.html" title="class in java.lang">String</a> description,
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boolean isReadable,
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boolean isWritable,
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boolean isIs)</pre>
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<div class="block">
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构造一个
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<code>MBeanAttributeInfo</code>对象。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>name</code> - 属性的名称。
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</dd>
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<dd>
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<code>type</code> -
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<code>type</code>的类型或类名。
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</dd>
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<dd>
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<code>description</code> -
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<code>description</code>的人类可读描述。
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</dd>
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<dd>
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<code>isReadable</code> - 如果属性具有getter方法，则为True，否则为false。
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</dd>
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<dd>
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<code>isWritable</code> - 如果属性具有setter方法，则为True，否则为false。
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</dd>
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<dd>
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<code>isIs</code> - 如果此属性具有“is”getter，则为True，否则为false。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<span><code><a href="../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果<code>isIs</code>是真的，但<code>isReadable</code>不是，或者如果<code>isIs</code>是真的， <code>type</code>不是<code>boolean</code>或<code>java.lang.Boolean</code> 。</span>
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<span>（新代码应始终使用<code>boolean</code>而不是<code>java.lang.Boolean</code> ）</span>
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</dd>
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</dl> </li>
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</ul> <a name="MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.String-boolean-boolean-boolean-javax.management.Descriptor-">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>MBeanAttributeInfo</h4> <pre>public MBeanAttributeInfo(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name,
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<a href="../../java/lang/String.html" title="class in java.lang">String</a> type,
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<a href="../../java/lang/String.html" title="class in java.lang">String</a> description,
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boolean isReadable,
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boolean isWritable,
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boolean isIs,
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<a href="../../javax/management/Descriptor.html" title="interface in javax.management">Descriptor</a> descriptor)</pre>
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<div class="block">
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构造一个
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<code>MBeanAttributeInfo</code>对象。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>name</code> - 属性的名称。
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</dd>
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<dd>
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<code>type</code> -
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<code>type</code>的类型或类名。
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</dd>
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<dd>
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<code>description</code> -
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<code>description</code>的人类可读描述。
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</dd>
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<dd>
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<code>isReadable</code> - 如果属性具有getter方法，则为True，否则为false。
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</dd>
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<dd>
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<code>isWritable</code> - 如果属性具有setter方法，则为True，否则为false。
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</dd>
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<dd>
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<code>isIs</code> - 如果此属性具有“is”getter，则为True，否则为false。
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</dd>
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<dd>
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<span><code>descriptor</code> - 属性的描述符。</span>
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<span>这可能是空的，这相当于空描述符。</span>
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<span><code><a href="../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果<code>isIs</code>是真的，但<code>isReadable</code>不是，或者如果<code>isIs</code>是真的， <code>type</code>不是<code>boolean</code>或<code>java.lang.Boolean</code> 。</span>
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<span>（新代码应始终使用<code>boolean</code>而不是<code>java.lang.Boolean</code> ）</span>
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</dd>
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<dt>
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<span class="simpleTagLabel">从以下版本开始：</span>
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</dt>
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<dd>
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1.6
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</dd>
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</dl> </li>
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</ul> <a name="MBeanAttributeInfo-java.lang.String-java.lang.String-java.lang.reflect.Method-java.lang.reflect.Method-">
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<!-- --> </a>
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<ul class="blockListLast">
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<li class="blockList"> <h4>MBeanAttributeInfo</h4> <pre>public MBeanAttributeInfo(<a href="../../java/lang/String.html" title="class in java.lang">String</a> name,
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<a href="../../java/lang/String.html" title="class in java.lang">String</a> description,
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<a href="../../java/lang/reflect/Method.html" title="class in java.lang.reflect">方法</a> getter,
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<a href="../../java/lang/reflect/Method.html" title="class in java.lang.reflect">方法</a> setter)
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throws <a href="../../javax/management/IntrospectionException.html" title="class in javax.management">IntrospectionException</a></pre>
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<div class="block">
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<p> <span>该构造函数使用简单属性的名称，以及用于读取和写入属性的Method对象。</span> <span>所述<a href="../../javax/management/Descriptor.html" title="javax.management中的接口"><code>Descriptor</code></a>所构造的对象将包括促成通过在任何注解字段<code>方法</code>包含对象<a href="../../javax/management/DescriptorKey.html" title="javax.management中的注释"><code>DescriptorKey</code></a>元注释。</span> </p>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>name</code> - 属性的编程名称。
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</dd>
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<dd>
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<code>description</code> -
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<code>description</code>的人类可读描述。
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</dd>
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<dd>
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<span><code>getter</code> - 用于读取属性值的方法。</span>
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<span>如果属性是只写的，可能为null。</span>
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</dd>
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<dd>
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<span><code>setter</code> - 用于写入属性值的方法。</span>
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<span>如果属性是只读的，则可以为null。</span>
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../javax/management/IntrospectionException.html" title="class in javax.management">IntrospectionException</a></code> - 此属性的定义存在一致性问题。
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</dd>
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</dl> </li>
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<!-- ============ METHOD DETAIL ========== -->
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<!-- --> </a> <h3>方法详细信息</h3> <a name="clone--">
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<li class="blockList"> <h4>clone</h4> <pre>public <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> clone()</pre>
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<div class="block">
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<p> <span>返回此实例的浅克隆。</span> <span>该克隆通过简单地调用<tt>super.clone()</tt>获得，从而调用由<tt>Object.clone()</tt>实现的默认原生浅克隆<tt>机制</tt> 。</span> <span>没有更深入地克隆任何内部领域。</span> </p>
|
||
<p> <span>由于这个类是不可变的，克隆主要是子类的兴趣。</span> </p>
|
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<dl>
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<dt>
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<span class="overrideSpecifyLabel">重写：</span>
|
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</dt>
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<dd>
|
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<code><a href="../../java/lang/Object.html#clone--">clone</a></code>在
|
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<code><a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code>
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</dd>
|
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<dt>
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<span class="returnLabel">结果</span>
|
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</dt>
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<dd>
|
||
这个实例的一个克隆。
|
||
</dd>
|
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<dt>
|
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<span class="seeLabel">另请参见：</span>
|
||
</dt>
|
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<dd>
|
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<span><a href="../../java/lang/Cloneable.html" title="java.lang中的接口"><code>Cloneable</code></a></span>
|
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</dd>
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<ul class="blockList">
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<li class="blockList"> <h4>getType</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getType()</pre>
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<div class="block">
|
||
返回属性的类名。
|
||
</div>
|
||
<dl>
|
||
<dt>
|
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<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
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类名。
|
||
</dd>
|
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</dl> </li>
|
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</ul> <a name="isReadable--">
|
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<!-- --> </a>
|
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<ul class="blockList">
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<li class="blockList"> <h4>isReadable</h4> <pre>public boolean isReadable()</pre>
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<div class="block">
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是否可以读取属性的值。
|
||
</div>
|
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<dl>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
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||
<dd>
|
||
如果属性可以读取，则为真，否则为false。
|
||
</dd>
|
||
</dl> </li>
|
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</ul> <a name="isWritable--">
|
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<li class="blockList"> <h4>isWritable</h4> <pre>public boolean isWritable()</pre>
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<div class="block">
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||
是否可以将新值写入属性。
|
||
</div>
|
||
<dl>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
||
如果属性可以写入，则为True，否则为false。
|
||
</dd>
|
||
</dl> </li>
|
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</ul> <a name="isIs--">
|
||
<!-- --> </a>
|
||
<ul class="blockList">
|
||
<li class="blockList"> <h4>isIs</h4> <pre>public boolean isIs()</pre>
|
||
<div class="block">
|
||
表示此属性是否为“是”吸气剂。
|
||
</div>
|
||
<dl>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
||
如果此属性具有“is”getter，则为true。
|
||
</dd>
|
||
</dl> </li>
|
||
</ul> <a name="toString--">
|
||
<!-- --> </a>
|
||
<ul class="blockList">
|
||
<li class="blockList"> <h4>toString</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> toString()</pre>
|
||
<div class="block">
|
||
<span class="descfrmTypeLabel">描述从类别： <code><a href="../../java/lang/Object.html#toString--">Object</a></code>复制</span>
|
||
</div>
|
||
<div class="block">
|
||
<span>返回对象的字符串表示形式。</span>
|
||
<span>一般来说， <code>toString</code>方法返回一个“textually代表”这个对象的字符串。</span>
|
||
<span>结果应该是一个简明扼要的表达，容易让人阅读。</span>
|
||
<span>建议所有子类覆盖此方法。</span>
|
||
<p> <span>该<code>toString</code>类方法<code>Object</code>返回一个由其中的对象是一个实例，该符号字符`的类的名称的字符串<code>@</code> ”和对象的哈希码的无符号的十六进制表示。</span> <span>换句话说，这个方法返回一个等于下列值的字符串：</span> </p>
|
||
<blockquote>
|
||
<span><pre>
|
||
getClass().getName() + '@' + Integer.toHexString(hashCode())
|
||
</pre></span>
|
||
</blockquote>
|
||
</div>
|
||
<dl>
|
||
<dt>
|
||
<span class="overrideSpecifyLabel">重写：</span>
|
||
</dt>
|
||
<dd>
|
||
<code><a href="../../java/lang/Object.html#toString--">toString</a></code>在类别
|
||
<code><a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code>
|
||
</dd>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
||
对象的字符串表示形式。
|
||
</dd>
|
||
</dl> </li>
|
||
</ul> <a name="equals-java.lang.Object-">
|
||
<!-- --> </a>
|
||
<ul class="blockList">
|
||
<li class="blockList"> <h4>equals</h4> <pre>public boolean equals(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> o)</pre>
|
||
<div class="block">
|
||
将此MBeanAttributeInfo与另一个进行比较。
|
||
</div>
|
||
<dl>
|
||
<dt>
|
||
<span class="overrideSpecifyLabel">重写：</span>
|
||
</dt>
|
||
<dd>
|
||
<code><a href="../../javax/management/MBeanFeatureInfo.html#equals-java.lang.Object-">equals</a></code>在
|
||
<code><a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">MBeanFeatureInfo</a></code>
|
||
</dd>
|
||
<dt>
|
||
<span class="paramLabel">参数</span>
|
||
</dt>
|
||
<dd>
|
||
<code>o</code> - 要比较的对象。
|
||
</dd>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
||
当且仅当
|
||
<code>o</code>是一个的MBeanAttributeInfo使得其
|
||
<a href="../../javax/management/MBeanFeatureInfo.html#getName--"><code>MBeanFeatureInfo.getName()</code></a> ，
|
||
<a href="../../javax/management/MBeanAttributeInfo.html#getType--"><code>getType()</code></a> ，
|
||
<a href="../../javax/management/MBeanFeatureInfo.html#getDescription--"><code>MBeanFeatureInfo.getDescription()</code></a> ，
|
||
<a href="../../javax/management/MBeanAttributeInfo.html#isReadable--"><code>isReadable()</code></a> ，
|
||
<a href="../../javax/management/MBeanAttributeInfo.html#isWritable--"><code>isWritable()</code></a>和
|
||
<a href="../../javax/management/MBeanAttributeInfo.html#isIs--"><code>isIs()</code></a>值相等（不一定相同），以与本的MBeanAttributeInfo的。
|
||
</dd>
|
||
<dt>
|
||
<span class="seeLabel">另请参见：</span>
|
||
</dt>
|
||
<dd>
|
||
<span><a href="../../java/lang/Object.html#hashCode--"><code>Object.hashCode()</code></a> ， <a href="../../java/util/HashMap.html" title="java.util中的类"><code>HashMap</code></a></span>
|
||
</dd>
|
||
</dl> </li>
|
||
</ul> <a name="hashCode--">
|
||
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|
||
<ul class="blockListLast">
|
||
<li class="blockList"> <h4>hashCode</h4> <pre>public int hashCode()</pre>
|
||
<div class="block">
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||
<span class="descfrmTypeLabel">描述从类别复制： <code><a href="../../java/lang/Object.html#hashCode--">Object</a></code></span>
|
||
</div>
|
||
<div class="block">
|
||
<span>返回对象的哈希码值。</span>
|
||
<span>支持这种方法有利于哈希表，如<a href="../../java/util/HashMap.html" title="java.util中的类"><code>HashMap</code></a>提供的。</span>
|
||
<p> <span><code>hashCode</code>的总合同是：</span> </p>
|
||
<ul>
|
||
<li> <span>只要在执行Java应用程序时多次在同一个对象上调用该方法， <code>hashCode</code>方法必须始终返回相同的整数，前提是修改了对象中<code>equals</code>比较中没有使用的<code>equals</code> 。</span> <span>该整数不需要从一个应用程序的执行到相同应用程序的另一个执行保持一致。</span> </li>
|
||
<li> <span>如果根据<code>equals(Object)</code>方法两个对象相等，则在两个对象中的每一个上调用<code>hashCode</code>方法必须产生相同的整数结果。</span> </li>
|
||
<li> <span><em>不</em>要求如果两个对象根据<a href="../../java/lang/Object.html#equals-java.lang.Object-"><code>Object.equals(java.lang.Object)</code></a>方法不相等，那么在两个对象中的每个对象上调用<code>hashCode</code>方法必须产生不同的整数结果。</span> <span>但是，程序员应该意识到，为不等对象生成不同的整数结果可能会提高哈希表的性能。</span> </li>
|
||
</ul>
|
||
<p> <span>尽可能多的合理实用，由<code>Object</code>类定义的hashCode方法确实为不同的对象返回不同的整数。</span> <span>（这通常通过将对象的内部地址转换为整数来实现，但Java的编程语言不需要此实现技术。）</span> </p>
|
||
</div>
|
||
<dl>
|
||
<dt>
|
||
<span class="overrideSpecifyLabel">重写：</span>
|
||
</dt>
|
||
<dd>
|
||
<code><a href="../../javax/management/MBeanFeatureInfo.html#hashCode--">hashCode</a></code>在
|
||
<code><a href="../../javax/management/MBeanFeatureInfo.html" title="class in javax.management">MBeanFeatureInfo</a></code>
|
||
</dd>
|
||
<dt>
|
||
<span class="returnLabel">结果</span>
|
||
</dt>
|
||
<dd>
|
||
该对象的哈希码值。
|
||
</dd>
|
||
<dt>
|
||
<span class="seeLabel">另请参见：</span>
|
||
</dt>
|
||
<dd>
|
||
<a href="../../java/lang/Object.html#equals-java.lang.Object-"><code>Object.equals(java.lang.Object)</code></a> ，
|
||
<a href="../../java/lang/System.html#identityHashCode-java.lang.Object-"><code>System.identityHashCode(java.lang.Object)</code></a>
|
||
</dd>
|
||
</dl> </li>
|
||
</ul> </li>
|
||
</ul> </li>
|
||
</ul>
|
||
</div>
|
||
</div> |