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<div class="subTitle">javax.jdo.identity</div>
<h2 title="Class ObjectIdentity" class="title">Class ObjectIdentity</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li><a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">javax.jdo.identity.SingleFieldIdentity</a></li>
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<li>javax.jdo.identity.ObjectIdentity</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a></dd>
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<pre>public class <span class="typeNameLabel">ObjectIdentity</span>
extends <a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></pre>
<div class="block">This class is for identity with a single Object type field.</div>
<dl>
<dt><span class="simpleTagLabel">Version:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../serialized-form.html#javax.jdo.identity.ObjectIdentity">Serialized Form</a></dd>
</dl>
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<h3>Fields inherited from class&nbsp;javax.jdo.identity.<a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></h3>
<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#hashCode">hashCode</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#keyAsObject">keyAsObject</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#msg">msg</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#ObjectIdentity--">ObjectIdentity</a></span>()</code>
<div class="block">Constructor only for Externalizable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#ObjectIdentity-java.lang.Class-java.lang.Object-">ObjectIdentity</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&nbsp;pcClass,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;param)</code>
<div class="block">Constructor with class and key.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#compareTo-java.lang.Object-">compareTo</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;o)</code>
<div class="block">Determine the ordering of identity objects.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#equals-java.lang.Object-">equals</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</code>
<div class="block">Determine if the other object represents the same object id.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#getKey--">getKey</a></span>()</code>
<div class="block">Return the key.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#hashCode--">hashCode</a></span>()</code>
<div class="block">Provide the hash code for this instance.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#readExternal-java.io.ObjectInput-">readExternal</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/ObjectInput.html?is-external=true" title="class or interface in java.io">ObjectInput</a>&nbsp;in)</code>
<div class="block">Read this object.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#toString--">toString</a></span>()</code>
<div class="block">Return the String form of the object id.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/jdo/identity/ObjectIdentity.html#writeExternal-java.io.ObjectOutput-">writeExternal</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/ObjectOutput.html?is-external=true" title="class or interface in java.io">ObjectOutput</a>&nbsp;out)</code>
<div class="block">Write this object.</div>
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<h3>Methods inherited from class&nbsp;javax.jdo.identity.<a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></h3>
<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#assertKeyNotNull-java.lang.Object-">assertKeyNotNull</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#compare-javax.jdo.identity.SingleFieldIdentity-">compare</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#createKeyAsObject--">createKeyAsObject</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#getKeyAsObject--">getKeyAsObject</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#getTargetClass--">getTargetClass</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#getTargetClassName--">getTargetClassName</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#hashClassName--">hashClassName</a>, <a href="../../../javax/jdo/identity/SingleFieldIdentity.html#setKeyAsObject-java.lang.Object-">setKeyAsObject</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
<a name="ObjectIdentity-java.lang.Class-java.lang.Object-">
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<h4>ObjectIdentity</h4>
<pre>public&nbsp;ObjectIdentity(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&nbsp;pcClass,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;param)</pre>
<div class="block">Constructor with class and key.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>pcClass</code> - the class</dd>
<dd><code>param</code> - the key</dd>
</dl>
</li>
</ul>
<a name="ObjectIdentity--">
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</a>
<ul class="blockListLast">
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<h4>ObjectIdentity</h4>
<pre>public&nbsp;ObjectIdentity()</pre>
<div class="block">Constructor only for Externalizable.</div>
</li>
</ul>
</li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
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<h3>Method Detail</h3>
<a name="getKey--">
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<ul class="blockList">
<li class="blockList">
<h4>getKey</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;getKey()</pre>
<div class="block">Return the key.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the key</dd>
</dl>
</li>
</ul>
<a name="toString--">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>toString</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<div class="block">Return the String form of the object id. The class of the
object id is written as the first part of the result so that
the class can be reconstructed later. Then the toString
of the key instance is appended. During construction,
this process is reversed. The class is extracted from
the first part of the String, and the String constructor
of the key is used to construct the key itself.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the String form of the key</dd>
</dl>
</li>
</ul>
<a name="equals-java.lang.Object-">
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<ul class="blockList">
<li class="blockList">
<h4>equals</h4>
<pre>public&nbsp;boolean&nbsp;equals(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</pre>
<div class="block">Determine if the other object represents the same object id.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#equals-java.lang.Object-">equals</a></code>&nbsp;in class&nbsp;<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>obj</code> - the other object</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if both objects represent the same object id</dd>
</dl>
</li>
</ul>
<a name="hashCode--">
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<h4>hashCode</h4>
<pre>public&nbsp;int&nbsp;hashCode()</pre>
<div class="block">Provide the hash code for this instance. The hash code is the
hash code of the contained key.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#hashCode--">hashCode</a></code>&nbsp;in class&nbsp;<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the hash code</dd>
</dl>
</li>
</ul>
<a name="compareTo-java.lang.Object-">
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<ul class="blockList">
<li class="blockList">
<h4>compareTo</h4>
<pre>public&nbsp;int&nbsp;compareTo(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;o)</pre>
<div class="block">Determine the ordering of identity objects.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - Other identity</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The relative ordering between the objects</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.2</dd>
</dl>
</li>
</ul>
<a name="writeExternal-java.io.ObjectOutput-">
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<ul class="blockList">
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<h4>writeExternal</h4>
<pre>public&nbsp;void&nbsp;writeExternal(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/ObjectOutput.html?is-external=true" title="class or interface in java.io">ObjectOutput</a>&nbsp;out)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Write this object. Write the superclass first.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html?is-external=true#writeExternal-java.io.ObjectOutput-" title="class or interface in java.io">writeExternal</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#writeExternal-java.io.ObjectOutput-">writeExternal</a></code>&nbsp;in class&nbsp;<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - the output</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
</ul>
<a name="readExternal-java.io.ObjectInput-">
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<h4>readExternal</h4>
<pre>public&nbsp;void&nbsp;readExternal(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/ObjectInput.html?is-external=true" title="class or interface in java.io">ObjectInput</a>&nbsp;in)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></pre>
<div class="block">Read this object. Read the superclass first.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html?is-external=true#readExternal-java.io.ObjectInput-" title="class or interface in java.io">readExternal</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html?is-external=true" title="class or interface in java.io">Externalizable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html#readExternal-java.io.ObjectInput-">readExternal</a></code>&nbsp;in class&nbsp;<code><a href="../../../javax/jdo/identity/SingleFieldIdentity.html" title="class in javax.jdo.identity">SingleFieldIdentity</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - the input</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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