racle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;</code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="containsKey(java.lang.Object)">
<h3>containsKey</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">containsKey</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/2