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IV. Java API s in Common Use Can switch work on byte, on long and on String? Before Java 5 switch(expr), expr could only be byte, short, char, int. Since Java 5, enumeration types have been introduced into Java, and expr can also be enum types. S ...

Combine the previous article How to cooperate with RestTemplate's elegant record requests and returned information We can easily use the Interceptor record information provided by restTemplate. For empirical reasons, can we also find its Interceptor ...

Summary: Spring's proxies are mainly divided into ProxyCreatorSupport s and ProxyProcessorSupport in the upper level, the former based on the proxy factory, the latter based on the postprocessor, or think of the postprocessor as the automatic proxy.When there are more beans in the spring container that require aop weaving, simply using ProxyFac ...

Summary: The two core technologies of Spring Framwork are IOC and AOP. AOP is widely used in Spring's product line. If reflection is the basis for your access to advanced level, then the agent is the base for you to stabilize the advanced level. The essence of AOP is also known as CGLIB dynamic proxy technology. It must have been used more or l ...

NIO (New IO) concept: Since version 1.4 of JDK, JDK has provided a new IO operation API. NIO provides non-blocking, non-blocking, highly scalable network I/O, which improves efficiency. NIO has three main core components: Channel, Buffer and Select ...

ConcurrentHashMap I. Overview Definition of Concurrent HashMap 2.1. Class Definition 2.2. Definition of member variables 2.3. Definition of paragraph: Segment 2.4,HashEntry Concurrent HashMap Concurrent Access 3.1 JDK 1.7 put(key,value) 3.2 JDK ...

Class File Loading Process (Class Loading Process) Load - > Connect (Verification - > Prepare - > Resolve) - > Initialization - > Use - > Unload Load In the loading stage, the jvm obtains such bytecode files (. class files) by the class name. The data structure in the file is then transferred to memory (converted into data str ...

    1. jdk creates thread pool Executors Tool Class itself provides us with several ways to create threads             2.Executors.newCachedThreadPool(); public static ExecutorService newCachedThreadPool() { return new ThreadPoolE ...

1. Haoop Single Computer Distribution 1. Establish hadoop user and set hadoop user password [root@server1 ~]# ls hadoop-3.0.3.tar.gz jdk-8u181-linux-x64.tar.gz [root@server1 ~]# useradd hadoop [root@server1 ~]# id hadoop uid=1000(hadoop) gid=1000(ha ...

I. What is AOP AOP (Face Oriented Programming) is a kind of programming thought, in which Spring AOP and AspectJ are both realistic programming ideas.In contrast to OOP (process-oriented programming), there is another way to program. For the cross-cutting problems that arise during OOP, these cross-cutting issues are business-independent and c ...