l</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">boolean</span>&nbsp;<span class="memberName">addAll</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;? extends <a href="MostlySingletonSet.html" title="type parameter in MostlySingletonSet">E</a>&gt;&nbsp;c)</span></div>
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<dt><span class