alue</a>,&#8203;T,&#8203;<a href="../JsonArray.html" title="interface in jakarta.json">JsonArray</a>&gt;&nbsp;downstream)</code></th>
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<div class="block">Constructs a <code>java.util.stream.Collector</code> that implements a "group by" operation on the
 input <code>JsonValue</code> elements.</div>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Collector.html?is-external=true" title