Programmer Group

JDK 13 was officially released on September 17, 2019. The new version contains five main features JEP 350: Dynamic CDS Archives JEP 351: ZGC: Uncommit Unused Memory JEP 353: Reimplement the Legacy Socket API JEP 354: Switch Expressions (Preview) JEP 355: Text Blocks (Preview) Dynamic CDS Archives First, we introduce CDS, which is called Class ...

1. AOP use case of JDK dynamic proxy public interface PersonService { void sayHello(); } public class PersonServiceImpl implements PersonService{ @Override public void sayHello() { System.out.println("lwh sayHello"); } } @Aspect public class Proxy1 { @Pointcut("execution(* *.sayHello(..))") public void sayHell ...

After obtaining all the enhancements of the corresponding bean s, the agent can be created. Back to the wrapIfNecessary method of AbstractAutoProxyCreator, as follows: 1 protected static final Object[] DO_NOT_PROXY = null; 2 3 protected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey) { 4 if (StringUtils.hasL ...

Before introducing various references, let's briefly introduce garbage collection. What is garbage collection? Garbage Collection (GC), as its name implies, is to release the space occupied by garbage and prevent memory leakage. Effective use of the memory that can be used to clear and recycle objects that have been dead or not used for a long ...

1. Basic types of packaging Recall that in the third article, when we learned about the basic data types in Java, we said that there are eight basic data types in Java, but these data are basic data, and it is very difficult to perform complex operations on them. What shall I do? 1.1 Summary of Basic Types of Packaging Classes In the actual ...

introduction AOP (Aspect Orient Programming), as a supplement to object-oriented programming, is widely used to handle some cross-cutting system-level services, such as log collection, transaction management, security checking, caching, object pool management, etc. The key of AOP implementation lies in the AOP proxy created automatically by AOP ...

Links to the original text: https://www.w3cschool.cn/quartz_doc/ Catalog 1. TimerTask with JDK 2. Use third-party packages: QuartZ Suitable for particularly complex business 3. Timing Task Management with Spring This is usually enough ...

Experimental environment JDK 1.8 IDE Intellij idea Flink 1.8.1 Experimental content Create a Flink Simple Demo that counts the number of words from the stream data. Experimental steps First, create a maven project, where the pom.xml file is as follows: <properties> <flink.version>1.8.1</flink.version> ...

lambda is a new feature of JDK 1.8. Functional programming can not be ignored. See: lambda underlying implementation principle 1. The compiler generates a method for each lambda expression The method name is lambda lambda $0,1,2,3,,1,2,3, but the expression referenced by the method does not genera ...

Reason analysis: By default, dubbo uses log4j as its logging framework. If you use a different logging framework, you may not have a log. Solve: It can be resolved by configuring the logger attribute of the application //slf4j,jcl,log4j,jdk,log4j2 <dubbo:application logger="log4j2" /> T ...