Java Threads calling methods on common Data Collector Object possible?

**The idea:** I have a JAX-RS webservice servlet (Object called `webServlet`) which instantiates a data collecting Object `dataCollector` and passes this object on to multiple threads in their constructor. These threads query websites for results and then call the `dataCollector.add(result)` method to add the results to a Queue within the shared `dataCollector`. **I have two questions regarding this idea:** 1) Can multiple threads call methods of a single shared object at the same time? 2) How does my `webServlet` object check when all threads are terminated to render a result page? Do I have to let my `webServlet` wait while all threads are running so I have a complete result list and how would I do that?

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