Java

Usually connect the database when the first to load the JDBC driver, this step actually there are three ways, their differences? Advantages and DisadvantagesQuick understanding of three loading methods Class.forName ("Com.mysql.jdbc.Driver")

1. What is class loadingClass loading refers to reading the binary data in the class's. class file into memory, placing it in the method area of the run-time data area, and then creating a Java.lang.Class object in the heap that encapsulates the

Heap sort Ah, actually is a data structure, binary tree, binary tree is divided into two fork tree and complete binary tree. A depth of k, and there are 2k-1 nodes called full two fork tree, complete binary tree: The depth of k, there are n nodes of

The working principle of hashmap is a common Java surface question in recent years. Almost every Java programmer knows HashMap, know where to use HashMap, know the difference between Hashtable and HashMap, then why this question is so special? It is

　　the input stream output stream is a program as a reference point. I. What is I/OI/O operations in Java mainly refer to using Java for input and output operations. All of Java's I/O mechanisms are input and output based on data streams that

Framework BasicsReflection: Reflection is a kind of dynamic correlation mechanism of Java development. Because the Java language itself is not a dynamic language, if we want to get the dynamic effect of the program, we introduce the concept of

Plan to complete this note in the following order, for example: Java Program Ape's JavaScript Learning notes (concept) Java Program Ape's JavaScript Learning notes (2--property copy and inheritance) Java Program Ape's JavaScript Learning

An inner class (Inner Class) is a class that is defined in another class. Corresponding to this, the class containing the inner class is called the outer class.The main functions of the inner class are as follows:1. The inner class provides a better

ObjectiveThis article summarizes some of the issues that the author encounters in Java Code view about log printing, and gives suggestions for modification. Due to limited capacity, inevitably there are errors and omissions, welcome correction.a .

one, byte output streamOutputStream Abstract classThis abstract class is a superclass of all classes that represent the output byte stream. The data of operation is byte, and the basic common function method of output byte stream is defined.

There are four ways to find string substrings in Java (indexof ())The IndexOf method returns an integer value that indicates the starting position of the substring in the string object. If no substring is found, 1 is returned.If the startindex is

Nine, interfaceInterfaces and internal classes provide us with a more structured approach to separating interfaces from implementations.1. Abstract classes and abstract methodsAbstract classes are a kind of moderation between common classes and

Recently, learning Java, and learning about Java IO (input and input), what is Java IO?IO flow is located in the Java.io packet, according to the operation data, divided into byte stream and character stream, according to different data input and

Java multithreading: deadlock and java Multithreading On the weekend, I saw an example of using jstack to view deadlocks. Last night I summarized the jstack (view thread), jmap (view memory), and jstat (Performance Analysis) commands. For your

Kakfa message delivery semantics and kakfa delivery SemanticsMessage Delivery Semantics At most once -- Messages may be lost but are never redelivered (Messages may be lost but will not be delivered repeatedly) At least once -- Messages are never

Java recursion implements the Fibonacci series and java recursion. The Programming Technique of program calling itself is called recursion ). Recursive Algorithms are widely used in programming languages. A process or function has a method that

Kafka Quick Start, kafkaStep 1: Download the code Step 2: Start the server Step 3: Create a topic Step 4: Send some messages Step 5: Start a consumer Step 6: Setting up a multi-broker cluster The configurations are as follows:

Build maven with the new version of IntelliJ IDEA, and create a web project with Maven (Graphic tutorial), intellijmaven I have never tried maven to manage projects before, but it is inconvenient to manually find the package export package. So today

Java Consistent Hash algorithm learning notes (sample code), consistenthash This article focuses on the ConsistentHashing algorithm code.Consistent Hash The consistent hash algorithm was proposed by the Massachusetts Institute of Technology (see 0)

Spring boot Logging configuration and Usage Details, springlogging This article is basically an official translation document! Spring boot uses Commons Logging as the internal log system and provides default configurations for Java Util Logging, Log4