How to open a .dat file in java program?

If so, then you rather need ObjectInputStream instead of DataInputStream to read it.

A . Dat file is usually a binary file, without any specific associated format. You can read the raw bytes of the file in a manner similar to what you posted - but you will need to interpret these bytes according to the underlying format.

In particular, when you say "open" the file, what exactly do you want to happen in Java? What kind of objects do you want to be created? How should the stream of bytes map to these objects?

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