Operator and Expression

Relational Floating-Point Operators   The relational floating-point operators compare two floating-point operands, leaving a boolean result.   Boolean Operators Boolean operators act on boolean types and return a boolean result.     The boolean operators   Description Operator Evaluation AND & Evaluation OR | Evaluation XOR ^ Logical AND && Logical OR || Negation ! Equal-to == Not-equal-to != Conditional ?:   The evaluation operators (&, |, and ^) evaluate both sides of an expression before determining the result.   The following code shows how the evaluation AND operator is necessary for the complete evaluation of an expression:   while ((++x < 10) && (++y < 15)) { System.out.println(x); System.out.println(y); }   The three boolean operators--negation, equal-to, and not-equal-to (!, ==, and !=) The negation operator toggles the value of a boolean from false to true or from true to false, depending on the original value. The equal-to operator simply determines whether two boolean values are equal (both true or both false). Similarly, the not-equal-to operator determines whether two boolean operands are unequal. The conditional boolean operator (? :) is the most unique of the boolean operators This operator also is known as the ternary operator because it takes three items: a condition and two expressions. The syntax for the conditional operator follows: Condition ? Expression1 : Expression2 The Condition, which itself is a boolean, is first evaluated to determine whether it is true or false. If Condition evaluates to a true result, Expression1 is evaluated. If Condition ends up being false, Expression2 is evaluated.

The Conditional class   class Conditional { public static void main (String args[]) { int x = 0; boolean isEven = false; System.out.println("x = " + x); x = isEven ? 4 : 7; System.out.println("x = " + x); } }   The results of the Conditional program follow: x = 0 x = 7 Output