Read e-book online Java Nio PDF

By Ron Hitchens

ISBN-10: 0596002882

ISBN-13: 9780596002886

Many critical Java programmers, in particular firm Java programmers, give some thought to the recent I/O API--called NIO for brand new Input/Output--the most vital function within the 1.4 model of the Java 2 usual variation. The NIO package deal comprises many stuff which were lacking from earlier versions of Java which are serious to writing high-performance, large-scale functions: advancements within the parts of buffer administration, scalable community and dossier I/O, character-set help, and ordinary expression matching. such a lot of all, it boosts functionality and velocity dramatically.Java NIO explores the hot I/O features of model 1.4 intimately and indicates you the way to place those positive factors to paintings to enormously increase the potency of the Java code you write. This compact quantity examines the common demanding situations that Java programmers face with I/O and exhibits you ways to exploit the functions of the hot I/O positive factors. You?ll how you can positioned those instruments to paintings utilizing examples of universal, real-world I/O difficulties and spot how the hot beneficial properties have an immediate effect on responsiveness, scalability, and reliability. The e-book includes:

  • A rundown of the hot positive factors in NIO
  • Basic and complicated I/O Concepts
  • Binary I/O and the hot buffer classes
  • Memory mapped records and dossier locking
  • Character I/O: encoding, interpreting and remodeling personality data
  • Regular Expressions and the hot java.util.regex package
  • Muliplexing with java.nio

Because the NIO APIs complement the I/O positive factors of model 1.3, instead of exchange them, you are going to additionally study whilst to exploit new APIs and whilst the older 1.3 I/O APIs are greater suited for your specific application.Java NIO is for any Java programmer who's drawn to studying easy methods to strengthen I/O functionality, but when you are constructing functions the place functionality is important, corresponding to video game computing or large-scale firm purposes, you should supply this e-book an enduring spot in your bookshelf. With the NIO APIs, Java now not takes a backseat to any language in terms of functionality. Java NIO can assist you know the advantages of those fascinating new features.

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Sample text

Data type Byte Char Short Int Long Float Double Table 2-1. Primitive data types and sizes Size (in bytes) 1 2 2 4 8 4 8 Each of the primitive data types is stored in memory as a contiguous sequence of bytes. For example, the 32-bit int value 0x037FB4C7 (decimal 58,700,999) might be packed into memory bytes as illustrated in Figure 2-14 (memory addresses increasing left to right). Notice 2 Booleans represent one of two values: true or false. A byte can take on 256 unique values, so a boolean cannot be unambiguously mapped to one or several bytes.

Both types of endian-ness, sometimes known as byte sex, are in wide-spread use today. There are good arguments for both approaches. Intel processors use the little-endian design. The Motorola CPU family, Sun Sparc, and PowerPC CPU architectures are all bigendian. The question of byte order even transcends CPU hardware design. When the architects of the Internet were designing the Internet Protocol (IP) suite to interconnect all types of computers, they recognized the problem of exchanging numeric data between systems with differing internal byte orders.

The clear( ) method makes a buffer empty, while reset( ) returns the position to a previously set mark. Let's see how this works. position(4); 30 Java NIO Figure 2-8. A buffer with a mark set If this buffer were passed to a channel now, two bytes would be sent ("ow"), and the position would advance to 6. If we then call reset( ), the position would be set to the mark as shown in Figure 2-9. Passing the buffer to the channel again would result in four bytes ("llow") being sent. Figure 2-9. A buffer position reset to its mark The output may not say anything sensible (owllow would be written down the channel), but you get the idea.

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Java Nio by Ron Hitchens

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