For example, if you want to add some sort of functionality to Java classes without polluting their hierarchy with a common superclass, consider creating a separate interface just for this one utility method. The main rule of thumb for using default methods is not to abuse them and not to make the code messier than it would be without it. However in small doses one can enhance existing interfaces and make them more useful in the codebase. This, as any powerful feature does, opens all sorts of doors for un-maintainable, confusing code, if abused. So since version 1.8 we can mark a method with the default keyword and provide the body of the method right in the interface. Breaking backward compatibility is a deal-breaker for Java. Previously, we couldn’t just add a method to an interface without requiring all the implementing subclasses to specify an implementation of the new method. The ability to specify default method implementations in interfaces was added into JDK 8 so that collections could evolve without breaking backward compatibility. TRY JREBEL FOR FREE Using Default Methods in Interfaces Skip rebuild and redeploy times to spend more time coding and less time waiting. Want more detail? Check out the sections below. Then, instead of get(), you'll want to use orElse() For - use plain objects within fields and method parameters and optional for return values.For Lambdas - use expressions instead of statements, refactoring to use method references and chaining Lambdas.Instead, you'll focus on conservative implementations for those enhancements. For Default methods - use 1 default method per interface, and don't enhance functional interfaces.At a glance, the best practices we've outlined in our cheat sheet are: Now that we've had a while to get to know JDK 8, we have a handful of Java best practices for the methods, Lambdas and the container. If you're just here for our Java 8 cheat sheet, you can click the button at the bottom of the page to download a printable PDF version. In addition, we'll talk about the Java 8 best practices that we've found so far. In this post we’ll look at the hot topics of the Java 8 language: default methods, lambdas and streams, and using Optional to represent absent values.
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