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byte[] b1 = null;
byte[] b2 = null;
System.out.println(b1 + b2); // 1
System.out.println("" + b1 + b2); // 2
if I uncomment 1 it’s giving compilation error.
if I uncomment 2 it’s printing nullnull;
so what’s happening here?
Line 2 is doing an implicit cast to String of both arrays and concatenating them, which is valid. In line one you are attempting to apply the add operator to two byte arrays, which is not supported.