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Set Minimum/Preferred Size on the Header (for advanced layouts) — If you use a layout manager that respects preferred sizes (like BoxLayout or BorderLayout). Outcome: set the preferred size of the header panel. | Because the poll() operation is competitive, there is no control over who poll() first to take out the head of the queue. Tension: t1 may have add(0), but t2 may have poll() the 0. Outcome: t1 may have add(0), but t2 may have poll() the 0. | The behavior is that I expected is that each threads enqueues and deques in the sequential order that the threads used in enqueue the values, but this is not the case. — using built-in java ArrayBlockingQueue and custom implementation. Outcome: q.add(...) and q.poll() may alternate.