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Lambda expression syntax variations

Lambda expression syntax variations - Java Tutorial

From the course: Java SE 11 Developer (1Z0-819) Cert Prep

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Lambda expression syntax variations

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- Let's investigate the syntax variations for lambda expressions. First, know that Java's lambda expressions are object expressions that must implement an interface. Lambdas are actually instances of some nameless automatically generated class, but they do differ from objects created from normal classes in that there is no this context created for the actual lambda object. The desired interface, that is the interface that our lambda should implement, must be unambiguously known from the context that the lambda expression is used in. The interface in question must always have exactly one abstract method. Although it doesn't matter whether the interface is annotated @FunctionalInterface, it must not create an error if we were to do so. Further, a lambda can only implement that one abstract method from the context interface, so there are still actually good uses for anonymous inner classes. So, let's take a look at the basic syntax of a lambda. Before we had lambdas, we might declare a…

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