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Home/ Questions/Q 7689425
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T20:09:48+00:00 2026-05-31T20:09:48+00:00

The Java tutorials here mention that &= is an assignment operator but doesn’t seem

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The Java tutorials here mention that &= is an assignment operator but doesn’t seem to mention what it does.

What does &= do?

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  1. Editorial Team
    Editorial Team
    2026-05-31T20:09:49+00:00Added an answer on May 31, 2026 at 8:09 pm
    a &= x
    

    is equivalent to

    a = (type of a)(a & x)
    

    which in turn is a

    • bitwise AND of a and x in the case where a and x are integers or a
    • non short-circuiting logical AND in the case of a and x being booleans (which means that x will be evaluated in any case here, even if a is false).

    There are several other binary operators which can be used with similar semantics, like +=, -=, *=, /=, %=, |=, <<=, …

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