Programmer Group

Introduction to new features of Java 8 1. Faster 2. Less code (new grammatical Lambda expressions added) 3. Powerful Stream API 4. Facilitate Parallelism 5. Optional to minimize null pointer exceptions   II. Lambda expression 1. Why use Lambda expression Lambda is an anonymous function. We can interpret Lambda expression as a piece of ...

Preface: The company has an asset statistics system, which is very low in usage, but requires fast query speed in use. Therefore, we want to make some caches stored in memory, not used for a long time, persistent to disk, and recycle garbage, return physical memory to the operating system, so as to save valuable resources to other businesses. S ...

Phase 5 Multithreading Preface: A scene: Weekend, with no female tickets to go to the movies, whether it is live tickets or mobile phone tickets, there is still a seat in the last second. After a moment of delay, it shows that the seat has been unable to be selected. If you don't pay attention to it, there will be no seat. The tickets of the c ...

This article continues with the introduction of Java's own performance monitoring tools. This article uses jmap tools to play with them.~ jmap (Java Memory Map) command can generate heap snapshots and object statistics of Java applications, analyze the generated heap snapshots, analyze the memory occupied by objects in the heap, check large ...

Recent research logs in search of things, see good articles on the record. Original address: http://www.infoq.com/cn/articles/why-and-how-log Logging in programs generally has two purposes: Troubleshooting and displaying the running state of programs. A good way of logging can provide us with enough evidence to locate problems. Loggin ...

Virtual Machine Parameters In the process of running a virtual machine, if it can track the running state of the system, it will be helpful to troubleshoot the problem. For this reason, the virtual machine provides some parameters to track the state of the system. If the given parameters are used to execute a java virtual machine, the relevan ...

Written in the foregoing, the author first read the source code of the framework, so there may be some misunderstanding errors or no detailed explanation. If you find errors in the reading process, you are welcome to comment and point out in the article below. The article will be updated in succession. You can pay attention to it or collect it. ...

In the traditional app development mode, online bugs occur, which can only be repaired after users manually update the new version. As app's business becomes more and more complex, the amount of code explosively grows, and the probability of bugs increases. If the online bugs are repaired only by distribution, the longer coverage period of the ...

Chapter 2 Concurrent Access to Objects and Variables Label: Java Multithread Programming <Java Multithread Programming Core Technology > Personal Notes Chapter 2 Concurrent Access to Objects and Variables synchronized synchronization method The variable in the method is thread-safe Instance variable non-thread security Mult ...

Let's start with an example:public class ClassLoaderTest{     public static void main(String[] args) {         ClassLoader cl = ClassLoaderTest.class.getClassLoader();         System.out.println(c ...