Java

OriginalHaiziSource:http://www.cnblogs.com/dolphin0520/This article belongs to the authorHaiziand Blog Park, welcome reprint, but without the consent of the author must retain this paragraph, and in the article page obvious location to the original

1. Understanding AnnotationsWe need to learn a little more about JDK 5.0 's new annotation (Annotation) technology because spring supports @aspectj, and @aspectj itself is a JDK 5.0-based annotation technology. So learning the annotated knowledge of

Heap Settings -xmx3550m: Set JVM maximum heap memory to 3550M. -xms3550m: Set the JVM initial heap memory to 3550M. This value can be set to the same as-xmx to avoid the JVM reallocating memory after each garbage collection completes. -xss1

OverviewIn multi-threaded concurrent processing, it is often necessary to make visibility access to resources and mutually exclusive synchronization operations. Sometimes we may learn from our predecessors that we need to do volatile or synchronized

The inner class is not very well understood, but it is actually a class that contains another class.As a person is composed of physical results, such as the brain, limbs, organs, or an internal class equivalent to one of the organs, such as the

Recently suddenly on the Java network programming this piece is very interested in, so find a lot of information, a little bit of trying, below is their own little insight, do not like to spray, welcome correction.First of all, talk about the client

Static represents the meaning of "global" or "static", which modifies member variables and member methods, and can also form statically static blocks of code, but there is no concept of global variables in the Java language.member variables and

This blog is mainly read by a Daniel's blog wrote, the Daniel wrote the database connection pool implementation, looked at his code, suddenly feel very cow. So here I also recorded my own demo, although not advocating the repetition of the wheel,

At present, many projects in the company need internationalization, and now the way is to replace the display by JS method, the process of switching language caused the Chinese and English language flicker appear, resulting in a very bad user

First, prefaceWe've already tasted the sweetness of deploying code on cloud servers, and now the main course is on the way to deploy our Javaweb project to a cloud server. Excited, huh? Calm and calm ~II. Deployment of the projectWe are already

20145335 Shanhao "Java Program Design" 4th Week Study summary Textbook study summarySixth chapter What is inheritance: Concept:Object-oriented, in order to avoid repeating defining common behavior among multiple classes. (simply, promote

I. Java garbage collection mechanismJava's garbage collection mechanism (Java garbage collection) is the ability of a Java virtual machine to dynamically reclaim the heap memory space occupied by objects without any references in an idle time, in an

I. Exception anomalies1. OverviewAn exception is an error that occurs while the program is runningException Origin: The problem is also a specific thing in real life, can also be described in the form of Java classes. and encapsulated into

Valid Java Reading NotesIntroduction creating and destroying objects When and how to create objects, when and how to avoid object creation, how to ensure that the created objects can be destroyed in a timely manner, and how to manage all the clear

Calling principles of overloading and rewriting for java method calls (1) Some time ago, I read the content of the third part of the virtual machine execution subsystem in "deep understanding JVM", and saw the calling principles of heavy load and

[Blue Bridge Cup] Number of previous questions about walnut, Blue Bridge previous questions about walnutNumber of walnuts for previous questionsTime Limit: 1.0 s memory limit: 256.0 MBProblem description Mr. Zhang is the software project manager and

Spring5: @ Autowired annotation, @ Resource annotation, and @ Service annotation, spring5 @ resource What is annotation? The traditional Spring method is to use the. xml file to inject beans or configure aop and things. This method has two

Atitit. Methods for Improving api compatibility v3 q326 and atititq326 Atitit. Method for Improving api compatibility v3 q326   1. Atitit. Compatibility "One plus three" policy 1 2. Extended table mode 1 3. 3. Simultaneous running mode 1 3.1. 3.1.

JVM -- Calculation of space occupied by Java objects0. Why do I need to know the space occupied by Java objects? Cache implementation: when designing the JVM cache (instead of using Memcached or Redis), you need to know whether the cached object

Java programmers must know eight major sorting orders, and java programmers must know  1. Insert directly to sort (1) Basic Ideas:In the number of groups to be sorted, assume that the number of the preceding (n-1) [n> = 2] is alreadyNow we need to