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<h4>addListener</h4>
<pre>public&nbsp;boolean&nbsp;addListener(<a href="../../nxt/util/Listener.html" title="interface in nxt.util">Listener</a>&lt;<a href="../../nxt/util/Listeners.html" title="type parameter in Listeners">T</a>&gt;&nbsp;listener,
                           java.lang.Enum&lt;<a href="../../nxt/util