Java

Work in the use of a lot of tools, third-party jar has a lot of ready-made tools to meet their own project needs, this time do not need to repeat the wheel, thus saving a lot of time, we can use these time to do other important things, if not meet

Recently in the study of big data related knowledge points, which need to implement file slicing and merging, complete Java implementation code, the following posted personal code, for reference onlyFirst build a Splitutil tool class, there are

Volatile in Java does not guarantee thread safety (example explained)Reprinted 2017-09-04 Think-007 I want to commentThe following small series to bring you a piece of Java in the volatile can not guarantee thread safety (the example explained).

Debug info unavailable The way to solve Java's small partners estimate that there is a habit of breakpoint code, it is easy to see the runtime code of some variables in the value.But there are some classes in the JDK that you will find

Lambda function Features: Anonymous-write less and think more. The function--lambda has an argument list, a function body, a return type, and a list of exceptions that can be thrown. Pass-through--LAMBDA expressions can be passed as

1.p132 Analysis:Long before = System.currenttimemillis ();Returns the current computer time, in which the expression format is the number of milliseconds that the current computer time and GMT time (GMT) January 1, 1970 0:0 0 seconds. You can also

First, two concepts: Lock pool and wait pool Lock pool: Assume that thread a already has a lock on an object (note: Not a Class), while other threads want to invoke some synchronized method (or synchronized block) of the object. Because

Textbook Knowledge Summary Fourth Chapter class and Object Classes: including class declarations and class bodies Basic format: class 类名 { 类体的内容 } class declaration: Class+ class Name (note: The

Before you make a mistake, the variable does not have a "rewrite" to say, only the method can be "rewritten". If we declare a variable in the subclass that is the same as the parent class, the actual case is that there are two variables of the same

Chapter Source: https://zhuanlan.zhihu.com/p/25539690Java performance optimization, sorting out an article for later restudying.JVM GC (garbage collection Mechanism)Before we learn the Java GC, we need to remember one word: Stop-the-world. It will

Original address: http://www.javatang.comA period of time on-line after the system upgrade, there is a serious high CPU problem, so began a series of optimization processing, now the process into a series of articles.Basic conceptsWhen analyzing a

1. Initial knowledge of Java1. What is Java? Java is a computer language, which is a high-level language and is a high-level language introduced by Sun Corporation (acquired by Oracle Corporation) in 1995.to enable software developers to develop

The Java Path interface is part of the Java NIO 2 Update which Java NIO received in Java 6 and Java 7. The Java Path interface is added to Java NIO in Java 7. The Path interface is located in the Java.nio.file package, so the fully qualified name of

1. OverviewIn Java, memory is divided into two kinds, one is stack memory and the other is heap memory.2. Heap Memory 1. What is heap memory? Heap memory is a type of Java memory that is used to store objects and arrays in Java, and

JSP Learning (JavaBean), jsp learning javabean Java Web LearningI, Build a java web development environment: (1) install jdk (2) install the Tomcat server (open source project of Apache), install Tomcat, and set Environment Variables (3) install

Processing file upload function of Spring Boot member management system, spring Member Management System Tip The Spring Boot member management system involves the Spring framework, SpringMVC framework, Hibernate framework, and thymeleaf template

Save Java file input, count a string, count all strings, java strings Import java. io. *; import java. util. *;/*** Created by Admin on 2018/3/20. */public class FileSaveTest {public static void main (String [] args) throws IOException {/* // enter

Java Study Notes (2), java Study NotesI. Common java Data Types Data Type Bytes occupied Note: Int 4   Char 2   Double 8   Float 4 Float a = 2f; (f or F must be added;

IntelliJ IDEA hot deployment plug-in JRebel installation text tutorial, intellijjjrebel Introduction to IntelliJ IDEA IDEA, short for IntelliJ IDEA, is an integrated environment for java Development. IntelliJ is recognized as one of the best java

Spring Boot integrates mybatis with multiple data sources. springmybatisPreface This tutorial is applicable to practical scenarios. You can simply add the copy code to your project for simple repair, modification, and usage. springboot and mybatis