Java 7 New Features Cookbook

Java 7 New Features Cookbook

By : Richard M. Reese, Jennifer L. Reese

Buy this Book

Java 7 New Features Cookbook

By: Richard M. Reese, Jennifer L. Reese

Buy this Book

Overview of this book

Java 7 is a major update that includes a lot of exciting new language improvements such as support for type inference and improved exception handling. Other new features include the ability to work with symbolic links, a greatly simplified directory traversal technique, and the monitoring of file creation and deletion. Improvements in event handling, security, and concurrent processing have also been added Java 7 New Features Cookbook is your go-to guide to learn about all the new exciting features Java 7 has to offer with a very practical recipe-based approach. The book starts with coverage of the new language improvements. Subsequent chapters address the new features of Java 7 while incorporating these new language improvements when possible. The new NIO techniques provide enhanced capabilities which are complemented by the new try-with-resources block and enhanced generic support. The new JLayer decorator and improved window methods enhance the developer’s ability to create GUI applications. The Java 7 New Features Cookbook provides a comprehensive coverage of the exciting features in Java 7.

Java 7 New Features Cookbook

Credits

About the Authors

Acknowledgement

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Java Language Improvements

Introduction

Using string literals in switch statements

Using underscores in literals to improve code readability

Using the try-with-resources block to improve exception handling code

Creating a resource that can be used with the try-with-resources technique

Catching multiple exception types to improve type checking

Rethrowing exceptions in Java 7

Using the diamond operator for constructor type inference

Using the @SafeVarargs annotation

Locating Files and Directories Using Paths

Introduction

Creating a Path object

Interoperability between java.io.File and java.nio.file.Files

Converting a relative path into an absolute path

Removing redundancies by normalizing a path

Combining paths using path resolution

Creating a path between two locations

Converting between path types

Determining whether two paths are equivalent

Managing symbolic links

Obtaining File and Directory Information

Introduction

Determining the file content type

Obtaining a single attribute at a time using the getAttribute method

Obtaining a map of file attributes

Getting file and directory information

Determining operating system support for attribute views

Maintaining basic file attributes using the BasicFileAttributeView

Maintaining POSIX file attributes using the PosixFileAttributeView

Maintaining FAT table attributes using the DosFileAttributeView

Maintaining file ownership attributes using the FileOwnerAttributeView

Maintaining a file's ACL using the AclFileAttributeView

Maintaining user-defined file attributes using the UserDefinedFileAttributeView

Managing Files and Directories

Introduction

Creating files and directories

Controlling how a file is copied

Managing temporary files and directories

Managing file ownership

Managing ACL file permissions

Managing POSIX attributes

Moving a file and a directory

Deleting files or directories

Managing symbolic links

Managing Filesystems

Introduction

Getting FileStore information

Getting Filesystem information

Using the SimpleFileVisitor class to traverse filesystems

Deleting a directory using the SimpleFileVisitor class

Copying a directory using the SimpleFileVisitor class

Processing the contents of a directory by using the DirectoryStream interface

Filtering a directory using globbing

Writing your own directory filter

Monitoring file events using WatchEvents

Understanding the ZIP filesystem provider

Stream IO in Java 7

Introduction

Managing simple files

Using buffered IO for files

Graphical User Interface Improvements

Introduction

Mixing heavyweight and lightweight components

Managing window types

Managing the opacity of a window

Creating a varying gradient translucent window

Managing the shape of a window

Using the new border types in Java 7

Handling multiple file selection in the FileDialog class

Controlling the print dialog box type

Using the new JLayer decorator for a password field

Handling Events

Introduction

Managing extra mouse buttons and high resolution mouse wheels

Controlling a focus when displaying a window

Using secondary loops to mimic modal dialog boxes

Handling spurious thread wakeups

Handling applet initialization status with event handlers

Database, Security, and System Enhancements

Introduction

Using the RowSetFactory class

Java 7 database enhancements

Using the ExtendedSSLSession interface

Using the platform MXBeans for JVM or system process load monitoring

Redirecting input and output from operating system's processes

Embedding a JNLP file in an HTML page

Concurrent Processing

Introduction

Using join/fork framework in Java

Using the reusable synchronization barrier Phaser

Using the new ConcurrentLinkedDeque safely with multiple threads

Using the new LinkedTransferQueue class

Supporting multiple threads using the ThreadLocalRandom class

Odds and Ends

Introduction

Handling weeks in Java 7

Using the Currency class in Java 7

Using the NumericShaper.Range enumeration to support the display of digits

JavaBean enhancements in Java 7

Handling locales and the Locale.Builder class in Java 7

Handling null references

Using the new BitSet methods in Java 7

Customer Reviews

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Obtaining a map of file attributes

An alternative way of accessing file attributes is to use the Files class' readAttributes method. There are two overloaded versions of this method, and they differ in their second argument and their return data types. In this recipe, we will explore the version that returns a java.util.Map object as it allows more flexibility in what attributes it can return. The second version of the method is discussed in a series of recipes, each devoted to a specific class of attributes.

Getting ready

To obtain a list of attributes in the form of a Map object, the following steps need to be done:

1. Create a Path object representing a file.
2. Apply the static readAttributes method against the Files class.
3. Specify the value of its arguments:
- The Path object representing the file of interest
- A String argument representing the attributes to be returned
- An optional third argument specifying whether symbolic links should be followed or not

How to do it...

1. Create a new console...

Java 7 New Features Cookbook

By : Richard M. Reese, Jennifer L. Reese

Java 7 New Features Cookbook

By: Richard M. Reese, Jennifer L. Reese

Overview of this book

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Current Title:

Java 7 New Features Cookbook

Obtaining a map of file attributes

Getting ready

How to do it...