<< - оператор сдвига влево: он сдвигает двоичное число, хранящееся в компьютере, влево. Например, 9 в двоичном формате равно 1001. 9 << 2 составляет 100100 в двоичном формате (36), потому что он сдвигает его влево и добавляет 0 в конце. 1 << n - это то же самое, что Math.pow (2, n), за исключением того, что это намного быстрее и лучше в целом, а также возвращает int, а не double.
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- In this article we show how to work with operators in Java. An operator is a special symbol which indicates a certain process is carried out.
- Чтобы задать переменной нужное значение, используют оператор присваивания. Это самый простой пример оператора в Java.
- Many people (erroneously) call it the ternary operator, because it's the only ternary (three-argument) operator in Java, C, C++, and probably many other languages.
- As we explore the operators of the Java programming language, it may be helpful for you to know ahead of time which operators have the highest precedence.Bulunamadı: оператор
- Операторы в Java: для чего нужны и какие бывают. Знакомимся с основными инструментами языка и учимся работать с ними на практике.
Hızlı yanıt: kod örneği
Yes, it is a shorthand form ofIt's called the conditional operator. Many people (erroneously) call it the ternary operator, because it's the only ternary (three-argument) operator in Java, C, C++, and probably many other languages. But theoretically there could be another ternary operator, whereas there can only be one conditional operator.The official name is given in the Java Language Specification:§15.25 Conditional Operator ? :The conditional operator uses the boolean value of one expression to decide which of two other expressions should be evaluated.Note that both branches must lead to methods with return values:It is a compile-time error for either the second or the third operand expression to be an invocation of a void method.In fact, by the grammar of expression statements (§14.8), it is not permitted for a conditional expression to appear in any context where an invocation of a void method could appear.So, if and are void methods, you cannot compress this:into this:Simple words:
int count;if (isHere) count = getHereCount(index);else count = getAwayCount(index);? :doSomething()doSomethingElse()if (someBool) doSomething();else doSomethingElse();someBool ? doSomething() : doSomethingElse();booleanCondition ? executeThisPartIfBooleanConditionIsTrue : executeThisPartIfBooleanConditionIsFalse