It sounds like the DD and the patrol boat you ran into where part of a anti-sub patrol seeing that you where in the Java Sea.
It is pretty common If I recall even in the stock game(not sure the version you are playing) to find 2 or 3 vessel anti-sub patrols in areas that are choke points such as narrow bodies of water between two land masses and pretty much every part of the Java Sea is a possible choke point so it is a good idea to be extra weary of anti-sub patrols in these areas or they might surprise you.
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