Beginning Java 8 Language Features: Lambda Expressions, - download pdf or read online

By Kishori Sharan

ISBN-10: 1430266589

ISBN-13: 9781430266587

Foreword via Jeff Friesen.

Beginning Java eight Language positive factors covers crucial and complex positive factors of the Java programming language similar to the hot lambda expressions (closures), internal periods, threads, I/O, Collections, rubbish assortment, streams, and extra. writer Kishori Sharan presents over 60 diagrams and 290 entire courses that can assist you visualize and higher comprehend the subjects lined during this book.

The booklet starts off with a chain of chapters at the crucial language beneficial properties supplied via Java, together with annotations, internal sessions, mirrored image, and generics. those themes are then complemented by means of information of the way to take advantage of lambda expressions, permitting you to construct strong and effective Java courses. The bankruptcy on threads follows this up and discusses every little thing from the very simple innovations of a thread to the main complex themes reminiscent of synchronizers, the fork/join framework, and atomic variables.

This e-book comprises unequalled insurance of Java I/O, together with NIO 2.0, the trail API, the FileVisitor API, the watch carrier and asynchronous dossier I/O. With this in-depth wisdom, your info- and file-management courses could be capable of reap the benefits of each characteristic of Java's strong I/O framework.

Finally, you'll how one can use the movement API, a brand new, fascinating addition to Java eight, to accomplish combination operations on collections of knowledge components utilizing functional-style programming. You'll study the main points of circulate processing similar to growing streams from diversified info resources, studying the variation among sequential and parallel streams, making use of the filter-map-reduce trend, and working with non-compulsory values.

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Read Online or Download Beginning Java 8 Language Features: Lambda Expressions, Inner Classes, Threads, I/O, Collections, and Streams PDF

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Extra resources for Beginning Java 8 Language Features: Lambda Expressions, Inner Classes, Threads, I/O, Collections, and Streams

Example text

RUNTIME) public @interface ChangeLogs { ChangeLog[] value(); } You can use the ChangeLog annotation to log change history for the Test class, as shown: @ChangeLog(date="02/01/2014", comments="Declared the class") @ChangeLog(date="02/21/2014", comments="Added the process() method") public class Test { public static void process() { // Code goes here } } The Native Annotation The Native annotation type is a meta-annotation that is used to annotate fields. It indicates that the annotated field may be referenced from native code.

Println(ann); } The toString() method of the Annotation interface returns the string representation of an annotation. Suppose you want to print the Version annotation on the Test class. You can do so as follows. The following code shows that you can use the major() and minor() methods. g. Version v), which can refer to an instance of that annotation type. The instances of an annotation type are created by the Java runtime. You never create an instance of an annotation type using the new operator.

The following snippet of code shows the skeleton of the process() method: public boolean process(Set annotations, RoundEnvironment roundEnv) { // The processor code goes here } The code you write inside the process() method depends on your requirements. In your case, you want to look at the major and minor values for each @Version annotation in the source code. If either of them is less than zero, you want to print an error message. To process each Version annotation, you will iterate through all Version annotation instances passed to the process() method as for (TypeElement currentAnnotation : annotations) { // Code to validate each Version annotation goes here } 36 CHAPTER 1 N ANNOTATIONS You can get the fully qualified name of an annotation using the getQualifiedName() method of the TypeElement interface.

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Beginning Java 8 Language Features: Lambda Expressions, Inner Classes, Threads, I/O, Collections, and Streams by Kishori Sharan


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