Preface
The Golden Nine and Silver Ten is coming to an end. November is a new month. Don’t be discouraged if you don’t find a job. We will continue to fight again in November.
The editor also organized the latest JAVA knowledge points and study notes for everyone, let's come to prostitute!
1、JVM
Regardless of the level of Java practitioners, JVM is a hurdle that must be overcome when advancing. Whether it is a job or an interview, JVM is a required test. If you don’t understand JVM, the salary will be very bad (nearly 70% of interviewers hang on JVM)
Introduced in detail JVM about threads, memory model, JVM runtime memory, garbage collection and algorithms, four reference types in Java, GC generational collection algorithm VS partition collection algorithm, GC garbage collector , JAVA IO/NIO, JVM class Major knowledge points of loading mechanism.
basic concepts:
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 the hardware.
JVM knowledge points
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2. Java collection
Usually, our program needs to know how many objects to create according to the program running time. But if it is not for the program to run, at the stage of program development, we simply don't know how many objects are needed, or even its exact type. In order to meet these conventional programming needs, we require that any number of objects can be created at any time and anywhere, and what should be used to accommodate these objects? We first thought of arrays, but arrays can only hold uniform types of data, and their length is fixed, so what should we do? The collection came into being!
- Interface inheritance and implementation
- List
- Set
- Map
Java collection framework diagram:
JAVA collection of knowledge points
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3. Java multi-threaded concurrency
Let's take a look at the concurrent knowledge base system diagram:
- How to implement/create Java threads?
- 4 kinds of thread pools?
- Thread life cycle (state)
- 4 ways to terminate threads
- What is the difference between sleep and wait?
- The difference between start and run?
- Java background thread
- Java lock
- Basic thread method
- Thread context switch
- Synchronization and deadlock
- Principle of Thread Pool
- Java blocking queue principle
- Usage of CyclicBarrier, CountDownLatch, Semaphore
- The role of the volatile keyword (variable visibility, prohibit reordering)
- How to share data between two threads?
- ThreadLocal function (thread local storage)
- The difference between synchronized and ReentrantLock
- ConcurrentHashMap concurrency
- Thread scheduling used in Java
- Process scheduling algorithm
- The concept and characteristics of threads
JAVA multithreaded concurrency knowledge points
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4. Deep analysis of spring principle
Spring is adopted by more and more microservice practitioners due to its many advantages. If you are proficient in Spring, you can become a leader in the field of rapid application development. However, you must know why. This article will help you understand the operating mechanism behind Spring from the perspective of Spring source code and core implementation principles.
Introduction catalog
- Features of Spring
- Spring's core components
- Spring commonly used modules
- Spring main package
- Spring common annotations
- Spring IOC principle
- Spring APO principle
- Spring MVC principle
- Spring Boot principle
- JPA principle
- Mybatis cache
- Tomcat architecture
spring knowledge points
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5. Microservices
Microservice is a knowledge point that you have to master in the Internet industry today, and it is also the most popular and popular knowledge. Let's take a look!
- Service registration discovery
- API gateway
- Configuration Center
- Service tracking
- Service fusing
- API management
Microservice knowledge points
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At last
Core knowledge summary knowledge points in addition to Netty and RPC, network, log, Zookeeper, Kafka, RabbitMQ, Hbase, MongoDB, Cassandra, 24 design modes, load balancing, database, consistency algorithm, Java algorithm, data Detailed knowledge of structure, distributed cache, etc. There is too much content to write out one by one.
Get information for free: Click here to get it for free, password: CSDN
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The above information is also free for everyone: click here to receive it for free, password: CSDN
