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POJava operator precedence guidelines
 

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    <p>Misunderstanding <strong>Java operator precedence</strong> is a source of frequently asked questions and subtle errors. I was intrigued to learn that even the <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.7" rel="nofollow noreferrer"><em>Java Language Specification</em></a> says, "It is recommended that code not rely crucially on this specification." <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.7" rel="nofollow noreferrer">JLS §15.7</a> Preferring <em>clear</em> to <em>clever</em>, are there any useful guidelines in this area?</p> <p>Here are a number of resources on the topic:</p> <ul> <li><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.12" rel="nofollow noreferrer">JLS Operators</a></li> <li><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.7" rel="nofollow noreferrer">JLS Precedence</a></li> <li><a href="http://mindprod.com/jgloss/precedence.html" rel="nofollow noreferrer">Java Glossary</a></li> <li><a href="http://www.cs.princeton.edu/introcs/11precedence/" rel="nofollow noreferrer">Princeton</a></li> <li><a href="http://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html" rel="nofollow noreferrer">Oracle Tutorial</a></li> <li><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html" rel="nofollow noreferrer">Conversions and Promotions</a></li> <li><a href="http://java.operator-precedence.com/" rel="nofollow noreferrer">Java Operator Precedence</a></li> <li><a href="https://stackoverflow.com/q/6800590/230513">Evaluation Order and Precedence</a></li> <li><a href="http://groups.google.com/group/comp.lang.java.programmer/browse_frm/thread/53e1b79100e7dd01" rel="nofollow noreferrer">Usenet discussion</a></li> </ul> <p>Additions or corrections welcome.</p>
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    1. COWhen in doubt, add more parentheses.
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    2. COAnd when there's too many parentheses, refactor.
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    3. COThat JLS quote (in context) encourages decomposition of statements that have multiple side-effects (or side-effects in sub-expressions) to avoid uncertainty about the relative timing of said side-effects in left and right sub-expressions. This cannot be accomplished by adding parentheses. In other words, the JLS advises against relying on Java's *Evaluation Order*, not against relying on operator precedence. The difference between these is explained [below](http://stackoverflow.com/a/13353263/13353263), and [here](http://stackoverflow.com/a/6801431/230513).
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