features in java 8

Java 8 Built-in functional interface for new features In the previous blog Lambda expression, referred to the functional interface provided by Java 8. In this article, we'll introduce Java's 84 most basic functional interfaces For a reference to a method, you need to defin

All new features and improvements of Java 8 include ): Language Improvement: JEP 126: Lambda expressions virtual extension methods JEP 138: Build a system based on Autoconf JEP 160: Lambda representation of Method Handles JEP 161: simple configuration file JEP 162: Prepare for modularization JEP 164: Use CPU commands to improve AES encryption perfo

interfaceSystem.out.println ("Use the default keyword to define the common method in the interface!" "); }}classMessageimplImplementsimassage{@Override Public voidprint () {System.out.println ("The implementation class of the interface! "); }}　　　 Test: public class Newinterface { public Span style= "color: #0000ff;" >static void main (string[] args) {Imassa GE massage = new Messageimpl (); // Normal method implementations call Massage.print ();

A core concept introduced in Java 8 is the functional interface (functional Interfaces).By adding an abstract method to the interface, these methods can be run directly from the interface.If an interface defines a unique abstract method , then this interface becomes a functional interface .At the same time, a new annotation was introduced:@FunctionalInterface.Can put him in front of an interface, indicating

can write this:For example, there are functional interfaces as follows:Package Com.demo.jdk8;public interface Animal {void eat (String food);}　　in the previous Lambda , there was a word for the functional interface1,This can be written in the place where the call is made (LAMDBA expressions):Animal A = food-and {System.out.println (food);}; A.eat ("fish");so write and write a class implementation Animal interface, and then new comes out the same. But this code will be more concise. 2.you can wr

OriginalFirst look at the instructions above:/** * A container object which may or could not contain A non-null value. * If A value is present, {@code isPresent ()} would return {@code true} and * {@code get ()} would return the value. *optional is a container object that may or may not contain a non-null value, and if this value exists, the Ispresent method will return the True,get method will return it itself * 　　And look at the class:Public final class OptionalHere is a final classThis is a v

the right person.comparebyage (A, B) method has defined the input and output.Therefore, the above code can be simplified as follows:Method reference notationArrays.sort(rosterAsArray, Person::compareByAge);Several typesMethod reference are available in the following categories: Reference static method: Classname::staticmethodname Reference Construction Method: Classname::new To reference an instance method on an instance apply: Instancereference::instancemethodname Referenc

"); ocuppys1.add ("teacher"); ocuppys1.add ("programer"); ocuppys1.add ("stuedent"); List ocuppys2 = new ArrayList (); ocuppys2.add Inessman "); role (" doctor "); ocuppys2.add (" teacher "); ocuppys2.add (" programer "); ocuppys2.add (" stuedent "); LambdaExpresstionTouris leTouris = new feature (); system. out. println ("use java 7 sort:"); System. out. printl

, and so on, and finally return a processed new stream object, can be chained calls in a number of ways to work together A class is after the new stream is processed to obtain the desired non-stream type result, such as the collection, the maximum value in the stream element, the number of elements remaining after filtering, etc. Stream Part I found a very detailed blog to write, want to further study can refer to http://ifeve.com/stream/ Use of double colons:Java8: This operator, whi

restricts the return value to type int . as this space is too short, a jumping introduction to an interface Binaryoperator/* Copyright (c), Oracle and/or its affiliates. All rights reserved. * ORACLE proprietary/confidential. Use are subject to license terms. */package java.util.function;import java.util.objects;import java.util.comparator;/** * Represents an operation upon Operands of the same type, producing a result * of the same type as the operands. This was a specialization of * {@link b

Package Com.atguigu.java8;import java.util.arraylist;import java.util.arrays;import java.util.Comparator; Import Java.util.list;import java.util.treeset;import org.junit.Test; Public classTestLambda1 {//the original anonymous inner class@Test Public voidtest1 () {ComparatorNewComparator() {@Override Public intCompare (String O1, String O2) {returnInteger.compare (O1.length (), o2.length ()); } }; TreeSetNewTreeset(COM); TreeSetNewTreesetNewComparator() {@Override Public int

parameters, and the lambda body has more than one statement, there is a return value. TEST3 * (x, y)->{implementation}; * Syntax format four: LAMBDA expression parameter list type can omit to write, if write must write all, the JVM can infer the parameter type by itself. * Comparator*/ Public voidtest1 () {Runnable runnable1=NewRunnable () {@Override Public voidrun () {System.out.println ("Hello"); } }; Runnable1.run (); System.out.println ("***************

Time Stamp Lock Multithreaded code has long been a poison for server developers (ask Oracle's Java language architect and parallel development guru Brian Goetz). Java's core libraries continue to incorporate complex usage to reduce the thread latency when accessing shared resources. One of these is the classic read-write lock (Readwritelock), which allows you to divide the code into two parts: a write that requires mutual exclusion and a read that do

First, the default method;With the default method, you can add an instantiation method to an interface (Interface interface_name):The code is as follows:1 Public Interface Testdefault 2 {3 Public default void Printhello () {4 System.out.println ("Hello world!" ); 5 }6 }Call this method: 1 public class Main implements testdefault{ 2 public static Span style= "COLOR: #0000ff" >void main (string[] args) 3 { 4 Main m = new Main (); // Create an instance 5 M

New Features of JDK 8-Lambda expressions and new features of JDK 8 lambda JDK 8 has been released for nearly four years. It seems a little out of date to talk about its new features ". Although JDK8 is no longer "new", Lambda expr

hidden files, folders, and drives" and click "OK" at the bottom. "Complete the setup, as shown in the following figure: Experiment Three: File breakpoint copy function Experiment Four: Windows 8 user logon methods (the difference between local users and Microsoft users logged in) Press Win+c on your desktop, change your computer settings-users, connect to a Microsoft account Experi

Although Microsoft has introduced many new features of Windows 8, Windows 8 still feels like a half matte of the pipa. By the end of this month, Windows 8 will be released in the first beta, and you will be able to experience this new operating system for yourself. Before that, if you have a vague understanding of Wind

One: Introduction In JDK1.8, Map has new methods, some of which are designed to simplify code, such as foreach, and other methods to prevent null and to make the code more rigorous. II: Map Public interface Map Three: Example @Test public void Putifabsent () {map The Java 8 contains a new set of time and date APIs under the package Java.time. The new date API is similar to the open source Joda-time libr

data security and privacy.Secure startup technology. Win8 writes the verification process on a TPM chip to fully ensure data security. 6. Windows 8 cloud computing support The Azure for Windows 8 development tool helps developers use Microsoft's cloud service platform azure resources to create a metro-style Windows 8 application. The new development tool mainly

Java-8 most popular images for understanding the Java mechanism and 8 images for Java The world is always better than ten million words! The following eight figures are from the Java tutorial of Program Creek. Currently, this is t