Signed right shift operator . Can anyone tell the below problem ?

Question

8>>1 =4 it's ok
-8>>1=-4 it's also ok
but if I write -8>>-1 then output is -1 why ??

Answer 1

I'm guessing here, but it looks to me as you completely shift the bits out filling the result with the sign bit: -8>>-1 = -8>>63 = -1. Note that 8>>-1 = 8>>63 = 0.
I couldn't find anything in the Java docs to verify the issue.
If you truly want to left shift on negative, test for it and handle it.