Download PDF by Maurice Naftalin: Mastering Lambdas: Java Programming in a Multicore World

By Maurice Naftalin

ISBN-10: 0071829636

ISBN-13: 9780071829632

The Definitive advisor to Lambda Expressions
Mastering Lambdas: Java Programming in a Multicore World describes how the lambda-related positive factors of Java SE eight will let Java to fulfill the demanding situations of next-generation parallel architectures. The booklet explains the best way to write lambdas, and the way to take advantage of them in streams and in assortment processing, delivering code examples all through. You'll the way to use lambda expressions to take complete benefit of functionality advancements supplied by means of today's multicore undefined. This Oracle Press e-book covers:

‌• Why lambdas have been wanted, and the way they'll switch Java programming
‌• Syntax of lambda expressions
‌• the fundamental operation of streams and pipelines
‌• utilizing creditors and relief to finish pipelines
‌• developing streams
‌• Spliterators, the fork/join framework, and exceptions
‌• interpreting circulate functionality with microbenchmarking
‌• API evolution utilizing default equipment

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Extra info for Mastering Lambdas: Java Programming in a Multicore World

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6 The use of “value-bearing” or “stream-bearing” to describe methods that return values or streams will soon become common enough to use without explanation; not quite yet, however. 37 38 Mastering Lambdas U executeFileOp(File f, Function fileOp) { ... } but the function type for Function does not declare any exceptions, so a call like executeFileOp(f, File::delete); will fail to compile. apply(f); } catch (IOException e) { // centralized exception handling } } To summarize: a lambda can handle an exception thrown to it in the same two possible ways as any other method—it can (implicitly) declare it to its caller or it can handle it in a catch block.

First, notice that many useful lambda expressions do not in fact inherit any names from their environment. Object-oriented programmers can understand this by analogy with static methods; although in general the behavior of objects depends on their state, it is often useful to de ne methods that do not depend on the system state in any way. Math, for example, contains only static methods—it makes no sense to take account of the system state in calculating, for example, the square root of a number.

However, this simple de nition can be complicated by two factors: rst, all interfaces declare (implicitly, if not explicitly) abstract methods corresponding to the public methods in Object, and the single abstract method of a functional interface is in addition to these. Most often the Object methods are declared implicitly, but not always; for example, Comparator explicitly declares a method equals that matches the equals method of Object. In such cases the explicit declaration makes no difference; Comparator still meets the de nition of a functional interface.

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Mastering Lambdas: Java Programming in a Multicore World by Maurice Naftalin

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