What does the class class [B represents in Java?

Those are arrays of primitives ([B == byte[], [C == char, [I == int). [Lx; is an array of class type x.

For a full list:

[Z = boolean[B = byte[S = short[I = int[J = long[F = float[D = double[C = char[L = any non-primitives(Object)

Also see the Javadoc for Class.getName.

java optimization memory jhat

Looks like an array of characters (C)/bytes (B)/ints (I).

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