Java

Objective In the previous article, we learned the adapter mode and bridge mode of the structural mode. This article is to learn the structure of the pattern of the appearance of the pattern and adorner mode.Appearance mode Brief introduction

Service Side PackageTCP;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;Importjava.net.InetSocketAddress;ImportJava.net.ServerSocket;ImportJava.net.Socket; Public classTcp_file_server {

Spark Streaming is an extension of the core Spark API to enable scalable, high-throughput, fault-tolerant streaming of real-time data streams. data can be obtained from many sources, such as kafka,flume,kinesis or TCP sockets, and can be processed

thread pool ConceptThe thread pool, in fact, is a container that accommodates multiple threads, where threads can be reused, eliminating the need to create thread objects frequently and consuming excessive resources without having to create threads

ObjectiveIn the previous article, we learned the adapter mode and bridge mode of the structural mode. This article is to learn the structure of the pattern of the appearance of the pattern and adorner mode.Appearance modeBrief introduction

Recently, in a systematic review of the knowledge of Java virtual machines, there is an interesting question: What is the type of Boolean in virtual machines? To answer this question, we look at the JDK source code is not able to solve the source

ImportOrg.apache.axis.client.Call;ImportOrg.apache.axis.client.Service;/*** @ClassName: Testaxis * @Description: TODO (Describe the role of this class) *@authorroy_70* @date April 18, 2017 morning 9:16:26 **/ Public classTestaxis { Public Static

ArrayList Collection-----Add method1, add (e) Adding elements to the collection　　/** * Check if the array capacity is sufficient * @param mincapacity */public void ensurecapacity (int mincapacity) {Modcount++;int oldcapacity = Elementda Ta.length;if

Prerequisite: ① has provided a WSDL interface ② the interface can be called normallyThere are two ways of doing this:1. Use CXF's Wsdl2java tool to generate a local class (using the local class).2. Call the Remote Web service method: Create a client

"Effective Java" catalog excerpt.I know it looks bad. In the present, the lack of actual operation, can only temporarily extract the directory. With the increase in practice, fill in more examples slowly.Chapter 2 Creating and destroying Objects

Why use internal classes?1. Internal classes provide better encapsulation, only external classes can access internal classes2. Inner classes can inherit an interface independently, independent of whether an external class inherits the interface3.

Preface: What is the difference between deep and shallow copies? Shallow copy: All variables of the copied object contain the same value as the original object, and all references to other objects still point to the original object. In other words,

Thread priority-related properties for threadsEach thread has a priority, and in thread, the attributes corresponding to the priority are as follows:/** * 线程的优先级属性 */private int priority;/** * 线程所能拥有的最大优先级. */public final static int MIN_PRIORITY = 1;

Boolean typeBoolean consumes one byte in memory.When the Java compiler compiles the Java source code into bytecode, it uses an int or byte to represent the Boolean. In a Java virtual machine, the integer zero is used to denote false, and any nonzero

One, Java read the properties file summaryIn a Java project, the operation of the properties file is often done, because a lot of configuration information will be written in the properties file, here is the main summary of the use of the

The static keyword in Java is primarily used for memory management (yes, you heard it wrong). We can apply it to variables, methods, blocks of code, nested classes, and import packages. A static keyword belongs to a class, not an instance of a class.

One, polymorphic:1. Object-oriented four basic features: abstraction, encapsulation, inheritance, polymorphismAbstraction, encapsulation, inheritance is the basis of polymorphism. Polymorphism is the expression of abstraction, encapsulation, and

When AES encryption is used. If cross-platform issues are involved. The notification encounters an issue where. NET is inconsistent with the Java encryption results. A solution has been found to be recorded. public class Aeshelper {public static

Note : The Class file described in this article is not specifically a file that exists in a specific disk, but a string of binary byte streams, regardless of the form in which it exists.1. IntroductionA Java class is compiled by a virtual machine

In Java8, there is the concept of stream flow. I personally think that the use of streams can help us better iterate over the collection of data.Let's take a look at the code for the normal for loop and stream stream.public static void Main (string[]