functional interface java 8

packages provide a class of GUI design and development. The java.awt package provides all the classes for creating an interface and drawing graphics images, while the Javax.swing package provides a set of "lightweight" components that try to make these components work the same way on all platforms. Javax.swing Java.text provides classes and interfaces for working with text, dates, numbers, and messages in a way that

How do we solve performance problems when we try to use the database in the Java 8 way?By partnering with Zeroturnaround, we've brought you a Java Zone. You can read the 8-step guide here to see how to improve your productivity when writing code, using the process of skipping slow application redeployment and implement

1. Using a stream to traverse a collectionBrief introduction:Java's collection framework, such as the list and map interfaces and the ArrayList and HashMap classes, makes it easy to manage both ordered and unordered collections. The collection framework has been continuously improved since the first day of introduction. In Java SE 8, we can manage, traverse, and aggregate collections through the flow's API.

, such as the mouse, keyboard and so on.Event Source: The component that generated the event, such as clicking on a button is the event sourceListener: Contains the event handler, which is responsible for checking whether the event occurred and, if so, activating the event handler to process itEvent handling: How the event is handled after it is raised.Example:Note: Here the event is added using anonymous inner class, if you are not clear about the anonymous inner class, please see my previous a

Java 8 is one of the most significant updates ever made since the advent of the Java language! It contains a very rich new feature. Today, we're going to explore Java 8 's programming approach, rethinking the Java conventions that

First, class loading mechanismThe classloader reads the binary data from the class's. class file into memory, places it in the method area, and then creates a Java.lang.Class object in the heap that encapsulates the data structure of the class within the method area. The final product loaded by the class is a class object located in the heap, which encapsulates the data structure of the class within the method area, and provides the Java programmer wi

the composition of JFC:• Agent Event model.• Light weight components.• Clipboard and data transfer.• Print and no mouse operation.1. awtabstract window Toolkit (AWT) Abstract Windowing ToolkitAWT is the older dual-interface function library, it still highly relies on the work platform itself has the function of drawing function, and with a smaller than the inclusion Program (Wrapper) is also a small design to remove, absorb the graphics

methods.　　② down transformation and runtime type recognitionAs the upward transformation loses the specific type information, we think that by going down the transformation should be able to get type information, in the Java language, all transformations will be checked. If the type does not match, a classcastexceptionis returned. This behavior of checking the type during run is called Runtime type recognition (RTTI).5. Summary Polymorphism means "di

; final static BigInteger FIVE = new BigInteger("5"); final static BigInteger TWENTYK = new BigInteger("20000"); //... private static TailCall Write a simple addition operation using the lambda expression in java 8 /*An interface. If there is only one explicitly declared abstract method,Then it is a function interface.Usually marked with @ FunctionalI

I. Introduction of threading 1. Multithreading and multi-process differences (1) The granularity of the two is different, the process is managed by the operating system, while the thread is within a process (2) Each process is the basic unit of operating system allocation resources and processor scheduling, with independent code, internal data, and state And a process of multithreading is only the basic unit of the processor scheduling, sharing the resources of the process,

As we all know, the Java IDE is to help programmers to write and debug Java programs more easily, a good IDE has a lot of features, such as debugging, editing, switching views and so on.The IDE's choices involve many aspects, such as the nature of the project, the team's and business preferences, and so on, but for some basic requirements, every good IDE must be fulfilled, for example, to support the langua

the use of final decoration, the value is fixed in memory, with static modifier is a class variable, not decorated is an instance variable (or method), So they become a fixed value when the class is established or the method is established. For example, the age of age in here is that he is final, so it cannot be modified in any way.3 abstractand interface Two keywords, he defines an abstraction class and interf