What is >> in java?

Question

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Double Greater Than Sign (>>) in Java?

What does the following achieve ?

int num = (10-2) >> 1;

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What are bitwise shift (bit-shift) operators and how do they work?

Do we need so many duplicate answers? Please people, stop posting identical answers. — Steve Kuo, Mar 29 '11 at 19:14

score 10 · Answer 1 · answered Mar 29 '11 at 16:42

10

Shift right. It moves all the bits of the number right by the number specified

10-2 = 8 = 1000 in binary

8 >> 1 = 1000 >> 1 = 100 in binary = 4

answered Mar 29 '11 at 16:42

thecoop

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And what happens when you shift `-1` to the right? Might as well have a complete answer. – Mark Peters Mar 29 '11 at 16:45

score 3 · Answer 2 · answered Mar 29 '11 at 16:42

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>> is just an operator to perform bitwise right shift

answered Mar 29 '11 at 16:42

jmj

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score 1 · Accepted Answer · answered Mar 29 '11 at 17:24

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its bitwise right shift in java. it shifts all binary digits,1 place towards right and pastes a zero at the leftmost end. (10-2)=8 which is 1000 in binary, now right shifting each digit and pasting 0 at the leftmost position, it gives 0100 which equals 4.

answered Mar 29 '11 at 17:24

desprado

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This answer is not correct: >> does preserve the leftmost digit (which is the sign indicator) whereas >>> does insert a `0` at the leftmost position. You may prove this by `0xFFFFFFFF >> 1` and `0xFFFFFFFF >>> 1`. – Harmlezz Jun 16 '15 at 09:14
@Harmlezz But `0xFFFFFFFF >> 1 ` gives -1 which is also `0xFFFFFFFF`. This seems weird! – insumity Dec 18 '15 at 21:09
@foobar `0xFFFFFFFF` means all bits are set to `1`. The `>>` operator shifts all bits one position to the right and preserves the left-most bit, which is `1`. Hence the value `0xFFFFFFFF` won't change. Its not weird but consequent :-) – Harmlezz Jan 04 '16 at 14:59

score 0 · Answer 4 · answered Mar 29 '11 at 16:41

0

Right shift the indicated number of bits.

answered Mar 29 '11 at 16:41

Jay

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OP could probably use a little bit of explanation. Chances are if OP doesn't know what the right shift operator is then OP doesn't know what the operation does either. – Brian Driscoll Mar 29 '11 at 16:42

score 0 · Answer 5 · answered Mar 29 '11 at 16:42

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http://download.oracle.com/javase/tutorial/java/nutsandbolts/operators.html

First result on google for ">> operator java"

answered Mar 29 '11 at 16:42

Peeter

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score 0 · Answer 6 · answered Mar 29 '11 at 16:43

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See the documentation here on Bitwise shift right

answered Mar 29 '11 at 16:43

Roger

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What is >> in java?

6 Answers6