![]() ![]() For example: CompletableFuture.supplyAsync(Foo::bar, myExecutor).thenRunAsync(s -> list.add(s)) Sometimes it's possible, however: if methods have a different number of parameters. If we do not perform proper type inference, we cannot choose the correct overloaded method. With this simple approach, however, it is easy to run into overloaded methods. Stream.forEach(.) method → such a method exists, its parameter has Consumer type, which is obviously not StringConsumer.Īnd that's how we could do without regular type inference.similarly, Stream.map(.) method → type.Stream.filter(.) method → type, we don't have to consider filter arguments.Let's consider the stream from the example above and determine whether the last lambda implements StringConsumer: As long as the erased type does not include generic parameters, everything is fine. Unlike the specification suggests, let it work only on the erased class types and make no reduction of the set of constraints, but simply follow a call chain. ![]() We can actually save some CPU time here, but only about 10%, so this doesn't solve the problem in its essence.Īlternatively, when the precise type inference is too complicated, it can be made approximate. Then the lambda type will be inferred as T, substitution still required. When searching for implementations of the Foo interface, we need to find all the classes that have implements Foo and interfaces that have extends Foo, as well as new Foo(.) ). In general, the source code is the most up-to-date information provider, and indexes are based on the source code.įinding immediate children is a simple task if we are not dealing with a functional interface. But this works only if nothing has been changed in the module after the compilation. We do this when the compilation is run by the IDE and not delegated, for example, to Gradle. One option is to save the complete class hierarchy in the index during compilation since the compiler builds it anyway. It's inefficient to iterate over all project classes when this feature is invoked. This feature is often called Type Hierarchy, and it looks just like the image on the right. In Java, one of the commonly used search options is searching for all implementations of an interface. Code search and navigation are important features of any IDE. ![]()
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