Java SE 8高级特性深度解析：企业与桌面开发权威指南

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《Java核心技术卷2：高级特性》(Core Java® Volume II - Advanced Features, Tenth Edition)是Cay S. Horstmann所著的一本权威指南，由Prentice Hall出版社于2016年12月发行，ISBN号码为9780134177878。本书专注于Java编程语言的高级特性和企业及桌面应用程序开发中的强大功能，适用于专业程序员。该书是前一版的升级版本，全面反映了Java SE 8的语言变化。它以实用、公正且不讲废话的方式，通过详尽测试的代码示例，深入讲解了Java的高级语言特性以及库功能。与以往版本一样，书中所有的代码易于理解，并展示了现代最佳实践，针对专业开发者在实际工作中遇到的真实世界问题提供了解决方案。《Core Java Volume II》特别关注Java SE 8的关键新特性及API，确保读者能够迅速掌握这些更新。作者对新语言和平台功能的详细介绍与对高级Java编程技术的洞察性解释紧密结合，帮助读者提升技能，构建高效、先进的Java应用。通过阅读本书，学习者将系统地了解以下知识点： 1. Java SE 8语言增强特性：包括新的语法、类库和工具集，如Lambda表达式、Stream API、Optional类等，这些都是为了提高代码的简洁性和性能而设计的。 2. 平台功能升级：这可能涉及对Java内存模型、并发处理、泛型和类型推断等方面的新改进，有助于编写更安全、可维护的并发代码。 3. 高级编程技术：如异常处理、反射、注解、动态代理、集合框架优化等，这些都是现代软件开发中不可或缺的技能。 4. 实战项目演练：书中提供的实例和案例研究让读者有机会在实践中应用所学知识，培养解决问题的能力。 5. 最佳实践与设计模式：书中强调了如何遵循现代编程原则，如单一职责原则、开闭原则等，以及如何结合设计模式进行优雅的编程。《Core Java核心技术卷2：高级特性》是Java开发者提升技能、扩展知识库的宝贵资源，无论是对于初次接触高级Java特性的开发者，还是希望深入探索Java最新技术的资深程序员，都是一本不可或缺的参考书籍。

A stream seems superficially similar to a collection, allowing you to transform and retrieve

data. But there are significant differences:

1. A stream does not store its elements. They may be stored in an underlying collection

or generated on demand.

2. Stream operations don’t mutate their source. For example, the filter method does not

remove elements from a new stream, but it yields a new stream in which they are not present.

3. Stream operations are

lazy

when possible. This means they are not executed until their

result is needed. For example, if you only ask for the first five long words instead of

all, the filter method will stop filtering after the fifth match. As a consequence, you

can even have infinite streams!

Let us have another look at the example. The stream and parallelStream methods yield a

stream

for the words list. The filter method returns another stream that contains only the words

of length greater than twelve. The count method reduces that stream to a result.

This workflow is typical when you work with streams. You set up a pipeline of operations

in three stages:

1. Create a stream.

2. Specify

intermediate operations

for transforming the initial stream into others,

possibly in multiple steps.

3. Apply a

terminal operation

to produce a result. This operation forces the execution of

the lazy operations that precede it. Afterwards, the stream can no longer be used.

In the example in Listing 1.1, the stream is created with the stream or parallelStream method.

The filter method transforms it, and count is the terminal operation.

In the next section, you will see how to create a stream. The subsequent three sections

deal with stream transformations. They are followed by five sections on terminal operations.

Listing 1.1 streams/CountLongWords.java

1 package streams;

3 import java.io.IOException;

4 import java.nio.charset.StandardCharsets;

5 import java.nio.file.Files;

6 import java.nio.file.Paths;

7 import java.util.Arrays;

8 import java.util.List;

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