om/en/java/javase/11/docs/api/java.base/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if command is null.</dd>
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<h4>schedule</h4>
<pre class="methodSignature">&lt;V&gt;&nbsp;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.