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>Although leaving out messaging and leaving in both int and Integer

Both are great choices... from performance point of view. Java is still modeled after plain C 1st and foremost. int should be the default and Integer(and Long) should be avoided. Up to java1.5, it took a manual operation (Integer.valueOf/intValue) to convert, so it was not abused as much. Marked integers have been in the works and they take a significant engineering effort for a nice to have feature.

When collection framework was introduced, it should have had primitive Maps/Lists - there was a regret (around java8 times) not including them initially - Streams attempted to amend the damage. The primitive types map directly to the hardware. Wrapped ones - they are pointer to an immutatable primitive and enjoy little optimization from the JIT.

As for swing, beans and properties - I'd say Delphi would have the most similarities.