What is the Arrow Operator (\'->\') in Java Lambda Expressions?

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Arrow Operator in Java: Unraveling the Lambda Syntax

While exploring code, you may encounter the arrow operator, "->". This operator, initially absent in Java, plays a crucial role in Java 8 through the introduction of lambda expressions.

Understanding Lambda Expressions

Lambda expressions provide a concise way to represent anonymous functions, offering an alternative to traditional method implementations. The syntax of a lambda expression is as follows:

(Parameters) -> { Body }

where "->" separates the parameters (left-hand side) from the implementation (right-hand side).

Application in Your Code

In the provided code snippet, you'll notice the arrow operator within a lambda expression:

return (Collection<Car>) CollectionUtils.select(listOfCars, (arg0) -> {
    return Car.SEDAN == ((Car)arg0).getStyle();
});

Translating to Original Syntax

IntelliJ 12's support for Java 8 allows for the use of lambdas and "folds" Predicates into lambda expressions. To obtain the original code without the lambda expression, replace it with:

return (Collection<Car>) CollectionUtils.select(listOfCars, new Predicate() {
    public boolean evaluate(Object arg0) {
        return Car.SEDAN == ((Car)arg0).getStyle();
    }
});

Compatibility Considerations

It's important to note that Java 8 and lambda expression support are not available in all Java versions. Therefore, compatibility with your project's Java version is crucial.

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