By Raoul-Gabriel Urma, Mario Fusco, Alan Mycroft
Java eight in motion is a essentially written consultant to the recent good points of Java eight. The e-book covers lambdas, streams, and functional-style programming. With Java 8′s practical positive aspects now you can write extra concise code in much less time, and likewise immediately take advantage of multicore architectures. It’s time to dig in!
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2. "); } }); But anonymous classes are still not good enough. First, they tend to be very bulky because they take a lot of space, as shown in the highlighted code here using the same two examples used previously: Second, many programmers find them confusing to use. 2 shows a classic Java puzzler that catches most programmers off guard! Try your hand at it. 2: Anonymous class puzzler What will the output be when this code is executed: 4, 5, 6, or 42? 49 Answer: The answer is 5, because this refers to the enclosing Runnable, not the enclosing class MeaningOfThis.
The Java 8 concept of Streams generalizes many aspects of Collections but both enables more readable code and allows elements of a stream to be processed in parallel. You can use a default method in an interface to provide a method body if an implementing class chooses not to do so. Other interesting ideas from functional programming include dealing with null and using pattern matching. 36 Chapter 2. Passing code with behavior parameterization This chapter covers Coping with changing requirements Behavior parameterization Anonymous classes Preview of lambda expressions Real-world examples: Comparator, Runnable, and GUI A well-known problem in software engineering is that no matter what you do, user requirements will change.
Behavior parameterization: filtering apples with predicates This is unnecessary overhead; can you do better? Java has a mechanism called anonymous classes, which let you declare and instantiate a class at the same time. They enable you to improve your code one step further by making it a little more concise. But they’re not entirely satisfactory. 3 shows a short preview of how lambda expressions can make your code more readable before we discuss them in detail in the next chapter. 1. Anonymous classes Anonymous classes are like the local classes (a class defined in a block) that you’re already familiar with in Java.