Java: right shift on negative number

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Because in Java there are no unsigned datatypes, there are two types of right shifts: arithmetic shift >> and logical shift >>>. http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html

Arithmetic shift >> will keep the sign bit.
Arithmetic shift

Unsigned shift >>> will not keep the sign bit (thus filling 0s).
Logical shift

(images from Wikipedia)

By the way, both arithmetic left shift and logical left shift have the same result, so there is only one left shift <<.

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