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The Java® Language Specification, Java SE 7 Edition, Fourth Edition by Alex Buckley, Gilad Bracha, Guy Steele, Bill Joy, James Gosling

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15.24. Conditional-Or Operator ||

The conditional-or operator || operator is like |15.22.2), but evaluates its right-hand operand only if the value of its left-hand operand is false.

ConditionalOrExpression:    ConditionalAndExpression    ConditionalOrExpression || ConditionalAndExpression

The conditional-or operator is syntactically left-associative (it groups left-to-right).

The conditional-or operator is fully associative with respect to both side effects and result value. That is, for any expressions a, b, and c, evaluation of the expression ((a) || (b)) || (c) produces the same result, with the same side effects occurring in the same order, as evaluation of the expression (a) || ((b) || (c)).

Each operand of the conditional-or operator ...

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