features in java 8

Java does not have direct access to the underlying operating system, but is accessed through local methods. The unsafe class provides hardware-level atomic operations that provide the following features:1, through the unsafe class can allocate memory, can free memory;The 3 local methods provided in the class Allocatememory, Reallocatememory, and freememory are used to allocate memory, expand memory, and fre

syntax is simpler and more readable. Developers do not need to declare the interface type. The type in the parameter list shows the object type. //Java 8PentFunction For the above Code, the developer can see that i3 is of the Double type, but in Java 8, the developer must count a few to see it, if you want to achieve this effect in

inherited by a special class, it can have different data types or behave differently. This makes the same property or service have different semantics in the generic class and in each of its special classes. For example, the drawing method for geometry, ellipse and polygon are subclasses of geometry, and the drawing method functions differently.3. 1. 3 Object-Oriented programming methodObject-oriented analysis of ooa-object oriented analysesObject-oriented design of ood-object orientedOoi-objec

return value; The constructor must be used with the new operator; 7, package: Java allows one or more classes together to become a group, said as a package for better management, Standard Java library is divided into many packages such as Java.lang, Java.util, java,net, etc., package is hierarchical, All Java

Object-oriented features in the Java language (Good summary) "Thinking before Class"1. What is an object? What is a class? What is a package? What is an interface? What is an internal class?2. What are the three properties of object-oriented programming? What are the characteristics of each of them?3. Do you know what are the unique

://www.logstash.net/7, Commons LoggingThe implementation of the Commons logging does not depend on the specific log Implementation tool, but provides some abstract interfaces for log operations, and it encapsulates other logging tools such as log4j, Avalon Logkit, and JDK 1.4.Official website: http://commons.apache.org/proper/commons-logging/8, Darks LogsDarks logs and log4j are similar, but also for Java,

Java 8–date Time APIJava 8 comes with a much improved and much required change in the the-the-time and time is handled.The classes that represent the date and time concepts is present in the Java.time package.The important classes in this package is: Java.time.Period:This class represents the date part of the DateTime. It represents the date part in terms of

support it without its own output window. 11. String definition C:char test[] = {"HelloWorld"}; c++:string test = "HelloWorld"; Python:test = "HelloWorld" Javascript:var test = "HelloWorld"; PHP: $test = "HelloWorld"; java:string test = "HelloWorld"; Analysis: This is supported, where C + +, Java is a standard library to the reality. 12. Strings String Connection C:test = strcat (test1, test2); C++:test = Test1 + test2; (STL library) Python:test = te

The world is always a picture more than tens of thousands of words!The following 8 images are from the program Creek Java tutorial, which is currently the most popular article on the site.I hope this article will help you to review the knowledge you already know. If the picture is not clear enough, you may need to read a detailed article or search.1. Properties of the string object that cannot be changed(pl

), Super.show (O), This.show ((Super) O), Super.show ((Super) O).Following the above object method call precedence and we are not hard to find the reason here!There are two main types of object polymorphism:(1) The Java system is automatically completed when the subclass object is transformed to the parent class object.(2) down transformation, when a parent object transforms into a subclass object, it must explicitly indicate the type of subclass to b

contributes to the simplification of the program:Cases: As you can see, write a tune () method for each class without using an upward transformation.　　　　However, by using an upward transformation, you only need to implement the tune method in the base class, and at the time of invocation, the method of invoking different classes can be implemented by different arguments. For Brass Frenchhorn = new Wind ();　　　 In fact, a brass object is defined, and it is understood that the object's referenc

you to transfer, process, manage, and retrieve logs, and provides web interfaces for developers to count and query log information with Logstash.Official website: http://www.logstash.net/7, Commons LoggingThe implementation of the Commons logging does not depend on the specific log Implementation tool, but provides some abstract interfaces for log operations, and it encapsulates other logging tools such as log4j, Avalon Logkit, and JDK 1.4.Official website: http://commons.apache.org/proper/comm

, when the program executes, the main method first enters the bottom of the stack memory, then the code from the top down to execute the loading method, etc. will be stacked one by one, also known as compression stack.3. Heap memory , loading instantiated objects executed in the stack memory, or some reference data types will open up a space in the heap memory and generate a 16-based address to the reference name.Attached: The specific implementation will be in line with the specific procedures

Java BASICS (8) Object-oriented (3) and java basics object-oriented Here are some of the knowledge points and code I summarized in my previous class. Most of the notes I think are very good and classic, sincerely hope that these will help those who want to learn! It is inconvenient to upload code by module. There are also many things, and they are also clear! If

As Oracle confirms the remaining 4 Java 9 features, the next generation of Java plans is beginning to become clearer, and Oracle has unveiled the second set of Java 9 features. Since Oracle announced 3 new APIs and modular sources earlier this year, it was Oracle's first lau

applications to a centralized system through the messaging system. The modular design allows the server to store, forward, alert, and generate log statistics for logs. Zlogfabric can collect data from files, syslog, log4j, log4net, and Windows events. Official website: http://www.zlogfabric.com/ 6. Logstash–java Log Management toolLogstash is a very powerful log management tool that enables you to transfer, process, manage, and retrieve logs, and pr

An error occurred while referencing the Java Library in the Android Studio2.1.2 Java 8 environment. studio2.1.2java8 Problem: In the Android Studio2.1.2 + Java8 environment, the Java Library is referenced, and dataBinding is in the enable State, which may cause compilation errors, as shown in: Solution: 1. Add the fol

Learn Java for a period of time, want to pass a few articles to do this period of study summary. The Java language is generally very affinity because of the basic features of C + +. Although often to the blog park to find information, but also has not written their own blog, now practice practiced hand, also for the future have a memory it.One, Introduction to

Transferred from: http://www.codeceo.com/article/8-java-log-framework.htmlAs a Java programmer, we have developed many Java applications, including desktop applications, Web applications, and mobile applications. However, the log system is essential for a mature Java applica

-term objective. The short-term objective is to work with the internal iteration and parallel processing of "Set-class batch processing" (as described below ); the long-term goal is to direct Java to the functional programming language (not to completely become a functional programming language, but to make it more functional programming language features ), for this reason, Oracle does not simply use inter