Preface
Java is a pure object-oriented programming language, so in addition to the basic syntax, you must understand its oop features: encapsulation, inheritance, and polymorphism. In addition, there are generic and reflective features. Many framework technologies rely on it. It is even more difficult to learn all of its technologies well. This note just makes up for this. This note contains The specific contents of all the knowledge points of java from basic to source code are as follows
Content summary: Including Java collections, JVM, multithreading, concurrent programming, design patterns, Spring family bucket, Java, MyBatis, ZooKeeper, Dubbo, Elasticsearch, Memcached, MongoDB, Redis, MySQL, RabbitMQ, Kafka, Linux, Netty, Tomcat, etc. Dachang interview questions, etc., wait for the technology stack!
Since the entire document is relatively comprehensive, the content is relatively large, and the length is not allowed, the following is a screenshot. If you need to get the information file, you can click here to download it by yourself . Download code: csdn . This note is perfect whether you use it for surprise interviews or check for missing knowledge points!
The following is a partial display of this note:
JVM
JVM is a hypothetical computer that can run Java code, including a bytecode instruction set, a set of registers, a stack,
a garbage collection, a heap and a storage method domain. JVM runs on the operating system, it has no direct
interaction with hardware .
JAVA collection
Collection classes are stored in the Java.util package, and there are three main types: set (set), list (list contains Queue) and map (mapping).
JAVA multi-threaded concurrency
The Thread class essentially implements an instance of the Runnable interface, representing an instance of a thread. The only way to start a thread
is through the start() instance method of the Thread class. The start() method is a native method, which will start a new thread
and execute the run() method.
Spring
It is a comprehensive one-stop solution for enterprise application development, which runs through the presentation layer, business layer, and persistence layer. But Spring
can still integrate seamlessly with other frameworks.
Microservice
Service registration is to maintain a register, which manages all service addresses in the system. When the new service starts, it will report
its address information to the register . The relying party of the service directly asks for the address of the Service Provider from the register. There
are many tools currently used for service registration, such as ZooKeeper, Consul, Etcd, and eureka from Netflix. There are two
forms of service registration : client registration and third-party registration.
Zookeeper
Zookeeper is a distributed coordination service that can be used for service discovery, distributed locks, distributed leader election, configuration management, etc.
Zookeeper provides a tree structure similar to the Linux file system (it can be considered a lightweight memory file system, but
only suitable for storing a small amount of information, not suitable for storing a large number of files or large files at all), and provides for each node Monitoring and
notification mechanism.
Kafka
Kafka is a high-throughput, distributed, publish/subscribe-based messaging system. It was originally developed by LinkedIn and
written in Scala. It is currently an open source project of Apache.
RabbitMQ
RabbitMQ is an open source implementation of AMQP developed by Erlang language.
Load balancing
Load balancing is based on the existing network structure. It provides a cheap, effective and transparent method to expand the bandwidth of network equipment and servers
, increase throughput, strengthen network data processing capabilities, and improve network flexibility and availability.
Distributed cache
- Cache avalanche
- Cache penetration
- Cache warm-up
At last
These notes probably include basic knowledge, Java collections, JVM, multi-threaded concurrency, spring principles, microservices, Netty and RPC, Kafka, diary, design patterns, Java algorithms, databases, Zookeeper, distributed caches, data structures, etc. All are distributed to friends for free, and those in need can click here to download by themselves, download code: csdn ! If you have thoroughly understood these knowledge notes, you can at least go to Alibaba to interview p7 post. It does not matter whether the interview is successful or not, it is important that you at least worked hard, right?