January 2014
Intermediate to advanced
736 pages
70h 43m
English
Content preview from Android™ How to Program, Second Edition
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Logical Negation (!)Operator
The ! (logical NOT, also called logical negation or logical complement) operator “reverses” the meaning of a condition. Unlike the logical operators &&, ||, &, | and ^, which are binary operators that combine two conditions, the logical negation operator is a unary operator that has only a single condition as an operand. The operator is placed before a condition to choose a path of execution if the original condition (without the logical negation operator) is false, as in the program segment
if ( ! ( grade == sentinelValue ) ) System.out.printf( "The next grade is %d\n", grade );
which executes the printf call only if grade is not equal to sentinelValue. The parentheses around the ...
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