Which statement about operator precedence in Java is true?

Which statement about operator precedence in Java is true?

• A. It can be changed using type casts
• B. It can be overridden using parentheses
• C. It is always evaluated left to right
• D. It depends on the compiler

Answer: (B)

In Java, the way an expression is grouped is determined by operator precedence and associativity. Parentheses act as a override mechanism: they tell the compiler to evaluate the stuff inside first, regardless of the usual precedence rules. For example, in a + b * c, multiplication is performed before addition, giving a + (b * c). If you want to compute (a + b) first, you can write (a + b) * c. That forced grouping is exactly what the statement about parentheses describes. Casting, while it changes the type of an expression, does not change the established precedence rules that determine how operators are grouped. It merely applies to the operand it precedes, and the overall grouping follows the normal precedence unless you explicitly insert parentheses. It's also not true that Java expressions are always evaluated left-to-right. Some operators are right-associative (such as assignment), and others have special associativity, so the general rule isn’t simply left-to-right for every expression. Finally, precedence in Java isn’t determined by the compiler; the language specification fixes the precedence and associativity rules, so conforming compilers behave the same way.

In Java, the way an expression is grouped is determined by operator precedence and associativity. Parentheses act as a override mechanism: they tell the compiler to evaluate the stuff inside first, regardless of the usual precedence rules. For example, in a + b * c, multiplication is performed before addition, giving a + (b * c). If you want to compute (a + b) first, you can write (a + b) * c. That forced grouping is exactly what the statement about parentheses describes.

Casting, while it changes the type of an expression, does not change the established precedence rules that determine how operators are grouped. It merely applies to the operand it precedes, and the overall grouping follows the normal precedence unless you explicitly insert parentheses.

It's also not true that Java expressions are always evaluated left-to-right. Some operators are right-associative (such as assignment), and others have special associativity, so the general rule isn’t simply left-to-right for every expression.

Finally, precedence in Java isn’t determined by the compiler; the language specification fixes the precedence and associativity rules, so conforming compilers behave the same way.