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Sunday, May 4, 2014
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Operator Precedence and Associativity to Evaluate Expression: JAVA

5:27 AMSunday, May 4, 2014
Operator precedence determines the order in which expressions are evaluated. This, in some cases, can determine the overall value of the expression. For example, take the following expression:
 Y  =  6  + 4/2

Depending on whether the 6+4 expression or the 4/2 expression is evaluated first, the value of y can end up being 5 or 8. Operator precedence determines the order in which expression are evaluated, so you can predict the outcome of an expression. In general, increment and decrement expression are evaluated before arithmetic expression; arithmetic expression are evaluated before comparisons, and comparisons are evaluated before logical expression. Assignment expression are evaluated are evaluated last.

Operator Precedence and Associativity to Evaluate Expression: JAVA


Above Table shows the specific precedence of the various operators in Java. Operators further up in the table are evaluated first; operator on the same line have the same precedence and are evaluated left to right based on how they appear in the expression itself. For example, given that same expression
Y = 6 + 4/2

You now known, according to this table, that division is evaluated before addition, so the value of y will be 8.

You always can change the order in which expressions are evaluated by using parentheses around the expressions you want to evaluate first. You can nest parentheses to make sure that expressions evaluate in the order you want them to (the innermost parenthetical expressions is evaluated first.

Consider the following expression:
y = (6 + 4)/2

This results in a value of5, because the 6+4 expression is evaluated first, and then the result of that expression (10) is divided by 2.

Parentheses also can be useful in cases where the precedence of an expressions isn’t immediately clear. In other words, they can make your code easier to read. Adding parentheses doesn’t hurt, so if they help you figure out how expressions are evaluated, go ahead and use them.

Operator Associativity

There is a linked term – Operator Associativity. Associativity rules determine the grouping of operands and operators in an expression with more than one operator of the same precedence. When the operations in an expression all have the same precedence rating, the associativity rules determine the order of the operators.

For most operators, the evaluation is done left to right, e.g.
X  = a + b – c

Here, addition and subtraction have the same precedence rating and so a and b are added and then from this sum c is subtracted. Again, parentheses can be used to overrule the default associativity, e. g.
X = a + (b-c);

However, the assignment and unary operators, are associated right to left, e.g.,
X += y -= -4; equivalent to X  += (y  -= (-(4) ) );

Assignment and Remaining operators 
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