Java >>> Operator

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Difference between >>> and >>

Could someone explain what the >>> operator does in in Java. I encountered it in this question, Hash method in HashMap. From its usage in the question it appears to be a shift operator - what's the difference between >>> and >>?

http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html — Hachi, Aug 29 '12 at 10:53
google: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html — Augusto, Aug 29 '12 at 10:54

score 4 · Accepted Answer · answered Aug 29 '12 at 10:53

4

From Java tutorial:

The unsigned right shift operator ">>>" shifts a zero into the leftmost position, while the leftmost position after ">>" depends on sign extension.

answered Aug 29 '12 at 10:53

Smi

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+1 Java needs this operator because `int` and `long` types are signed. It doesn't need an unsigned left shift because that would do the same thing. – Peter Lawrey Aug 29 '12 at 10:56

score 2 · Answer 2 · answered Aug 29 '12 at 10:57

2

You can see the difference with a simple program:

public static void main(String[] args) throws InterruptedException, IOException {
    int i = -1;
    int j = i >> 1;
    int k = i >>> 1;
    System.out.println("i = " + i + "\t\t<=> " + Integer.toBinaryString(i));
    System.out.println("j = " + j + "\t\t<=> " + Integer.toBinaryString(j));
    System.out.println("k = " + k + "\t<=> " + Integer.toBinaryString(k));
}

output:

i = -1          <=> 11111111111111111111111111111111  
j = -1          <=> 11111111111111111111111111111111  
k = 2147483647  <=> 1111111111111111111111111111111

answered Aug 29 '12 at 10:57

assylias

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from where does this number 2147483647 come from? – eagertoLearn Sep 27 '13 at 20:31
The largest positive integer (all bits at 1 except the sign bit which is the left most one). – assylias Sep 27 '13 at 21:46

score 0 · Answer 3 · edited Jan 11 '14 at 05:50

0

the signed right shift operator ">>" shifts a bit pattern to the right.The unsigned right shift operator ">>>" shifts a zero into the leftmost position,

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edited Jan 11 '14 at 05:50

Hungry Blue Dev

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answered Aug 29 '12 at 10:57

Mohammod Hossain

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Java >>> Operator

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