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

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By Maurice Naftalin

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 permit Java to satisfy the demanding situations of next-generation parallel architectures. The e-book explains tips to write lambdas, and the way to exploit them in streams and in assortment processing, supplying code examples all through. You'll how you can use lambda expressions to take complete benefit of functionality advancements supplied by means of today's multicore undefined. This Oracle Press publication covers:

‌• Why lambdas have been wanted, and the way they are going to switch Java programming
‌• Syntax of lambda expressions
‌• the fundamental operation of streams and pipelines
‌• utilizing creditors and relief to finish pipelines
‌• growing streams
‌• Spliterators, the fork/join framework, and exceptions
‌• studying flow functionality with microbenchmarking
‌• API evolution utilizing default tools

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

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If you see a type variable in a method declaration but not in the class declaration, then you can assume it is a type parameter of the method. • Diagrams are not necessarily complete—they list only the methods important for the discussion. replaceAll((Point p) -> { /* return new Point object */ }); For this to compile, the lambda expression must match the function type of UnaryOperatorăPointą, which is the type of the method public Point apply(Point p); This case is straightforward, but in general the matching process offers some new challenges to type checking.

2. An inner class declaration creates a new naming scope, within which this and super refer to the current instance of the inner class itself; by contrast, lambda expressions do not introduce any new naming environment. In this way they avoid the complexity in name lookup for inner classes that causes many subtle 21 22 Mastering Lambdas errors, such as mistakenly calling Object methods on the inner class instance when the enclosing instance was intended. These points are explained further in the next two subsections.

2 Scoping Rules for Lambdas The scoping rules for anonymous inner classes, like those for most inner classes, are complicated by the fact that they can refer both to names inherited from their supertypes and to names declared in their enclosing class. 2 Other than its parameters, names used in the body of a lambda expression mean exactly the same as they do outside the body. , a eld name can be temporarily redeclared as a parameter or local variable name). , its functional interface). Interfaces can declare—besides abstract methods—static nal elds, static nested classes, and default methods (see Chapter 7).

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