An Introduction to Java Programming

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Sadegh Aliakbary

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AgendaJava New APIs for IONIONIO.2

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The First Version of Java I/O APIsjava.io packageThe File class limitations:

more significant functionality required (e.g. copy method)

defines many methods that return a Boolean value In case of an error, an exception is better than a

simple false.Poor support for handling symbolic linksinefficient way of handling directories and pathsvery limited set of file attributes

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Java New IO (NIO)Introduced in Java 1.4 (2002)The key features of NIO were:Channels and SelectorsBuffersCharset

java.nio.charsetencoders, and decoders to map bytes and

Unicode symbols

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NIO.2Introduced in Java 1.7 (2011)Java 7 introduces the java.nio.file packageNew interfaces and classes

Path, Paths, and Files

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Path and PathsPath is an interface while Paths is a class

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Path interface

The toPath() method in the java.io.File class returns the Path object; this method was added

in Java 7The toFile() method in the Path interface to

get a File object

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The Files Classthe java.nio.file packageProvides static methods for copy, move,

delete, …New methods for

Symbolic linked filesAttributes…

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copyPath pathSource = Paths.get(str1);Path pathDestination = Paths.get(str2);Files.copy(pathSource, pathDestination);

it will not copy the files/directories contained in the source directory

you need to explicitly copy them to the destination folder

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Listening for ChangesPath path = Paths.get("..\\src");WatchService watchService = null;

watchService = path.getFileSystem().newWatchService();path.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY);

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