What is the meaning of "org.springframework.integration.websocket.IntegrationWebSocketContainer.getSubProtocols() and java.util.Collection.toArray()" if the value of "c" is empty?

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If the value of "c" is empty, it means that the collection is currently not holding any elements. In the context of the methods "org.springframework.integration.websocket.IntegrationWebSocketContainer.getSubProtocols()" and "java.util.Collection.toArray()", this would mean that there are no subprotocols available for the WebSocket container to use.

Calling "org.springframework.integration.websocket.IntegrationWebSocketContainer.getSubProtocols()" would return an empty list of subprotocols, indicating that the WebSocket container is not configured to support any specific protocols.

Calling "java.util.Collection.toArray()" on an empty collection would return an empty array, because there are no elements in the collection to be returned as an array.