Java Novice tutorial, Java Learning roadmap (video + notes + tools)

It has been four years since I entered the Internet industry.

Looking back at my first exposure to Java, it was in a college class, obscure knowledge, and now I can recall the fear of being dominated by the final exam.

Until the Internet into this industry, and then think back to their entire journey into the work, summed up the route of learning Java, hope to help you enter the Java small white.

Outline of a,

Most things, there is a goal to action, action in order to achieve the goal. You can also write them down or print them out and place them in a visible place next to you to help you motivate yourself.

Learn Java, but not only learn Java, because in the computer this tree, Java is just a leaf.

A qualified Coder, in addition to Java, also need to be familiar with the operating system, computer network, database, front-end, middleware, framework and so on these things, if you want to become a Top Coder, project management, English, communication, algorithm is also very important.

In terms of employment, I personally think that master the Java foundation, computer foundation, the use of tools, databases, Web front-end, Javaweb, framework use, Linux, middleware, even an entry-level Coder.

First, Java foundation

Let me list the things that you really need to learn in the Java basics.

01. Introduction to Java

Overview of the Java Language
Relationships among JDK, JRE, and JVM in Java
Public class and class in Java
Java identifiers and keywords
Java variable
Java data types
Java operator.
Java expressions & statements & code blocks
Comments in Java

02, Java control statements

Java if else
Java switch statement
Java for loop
The Java while loop
Java break statement
Java the continue statement

03. Java arrays

Java array
Multidimensional array
Java Array copy

Java Object-oriented (1)

Java classes and objects
Java method
Java method overloading
Java constructors
Java string
Java Access
The Java this keyword
Java Final keyword
Java recursive
Java Instanceof operator

Java Object-oriented (2)

Java inheritance
Java method override
Java Super keyword
Abstract class & Abstract method
Java interfaces
Java polymorphism
Java packages

Java Object-oriented (3)

Nested & inner classes
Java static keyword
Java anonymous inner class
Java singleton
Java enumeration class
The Java enumeration constructor
Java enumeration string
Java reflection

07, Java exception handling

Introduction to Java Exceptions
Java Exception Handling
Java try catch
Java throw and throws
Java catches multiple exceptions
Java try-with-resources
Java annotations
Java annotation types
The Java log
Java assertion

08. Java collections

Java Collections Framework
Java Collections Interface
Java List interface
Java ArrayList
Java Vector
Java Stack

09. Java queues

Java Queue Interface
Java priority queue
Java dual-end queue interface
Java LinkedList
Java Array Queue
Java blocking queue interface
Java ArrayBlockingQueue
Java LinkedBlockingQueue

10, Java Map

Java Map interface
Java HashMap
Java LinkedHashMap
Java WeakHashMap
Java EnumMap
Java SortedMap interface
Java NavigableMap interface
Java TreeMap
Java ConcurrentMap interface
Java ConcurrentHashMap

11, Java Set

Java Set interface
Java HashSet
Java EnumSet
Java LinkedHashSet
Java SortedSet interface
Java NavigableSet interface
Java TreeSet
Java set algorithm
Java iterator interface
Java ListIterator interface

12. Java byte streams

Introduction to Java IO flows
Java InputStream
Java OutputStream
Java FileInputStream
Java FileOutputStream
Java ByteArrayInputStream
Java ByteArrayOutputStream
Java ObjectInputStream
Java ObjectOutputStream
Java BufferedInputStream
Java BufferedOutputStream
Java PrintStream

13. Java character stream

Java Reader
Java Writer
Java InputStreamReader
Java OutputStreamWriter
Java FileReader
Java FileWriter
Java BufferedReader
Java BufferedWriter
Java StringWriter
Java PrintWriter

14. Java concurrent programming

Process and line
Multithreaded entry and interface
Thread groups and thread priorities
Thread state and main transformation methods
Communication between threads
Reordering and happens-before
volatile
Synchronized with the lock
CAS and atomic operations
AQS
Schedule a task
Stream parallel computing principle
Frok/Join
Communication tool class
CopyOnWrite
Concurrent collection container
Lock interfaces and classes
Blocking queue
Thread pool Principle

15. Java VIRTUAL machine

Java memory structure
The heap
The stack
The garbage collection
JVM memory region
Java virtual machine stack
The class file
Bytecode instruction
JVM parameter tuning
Java Object Model
HotSpot
Class loading mechanism
Compile and decompile
Decompiler tool (JavAP)
JIT
Vm performance monitoring and troubleshooting tools (JPS, JStack, JMAP, Jstat, JConsole, and JavAP)

How do you systematically learn?

Recommend a set of video, power node old du talk Java zero basic tutorial, in B station to see.

www.bilibili.com/video/BV1Rx…

2. Basic computer skills

What does computer basics include?

Computer composition principle, operating system, computer network, data structure and algorithm. Principle of computer composition

First say computer composition principle, this part of the content mainly involves

Computer System Overview
Data and operations
Summary of the CPU
Overview of the Storage Subsystem
Overview of bus and IO

Study “Introduction to Computer Major”

Introduction to computer Science will give you a general idea of the subject you are studying, focusing on breadth rather than depth.

If you’re a software engineering major, you can also go to The Introduction to Software Engineering.

3. Use of tools

Intellij IDEA if you want to write quality Java code but also be efficient, use it!

Check out this Intellij IDEA instructional video on website B.

www.bilibili.com/video/BV14t…

As you all know, a version control system is very important ！！！！！！

Even if you’re coding alone, it can help you take snapshots of your project, record every change, create different branches, and so on.

This is especially valuable if you are working with multiple people, as you can not only see what others are doing to the code, but also resolve conflicts caused by parallel development.

There are many version control systems, one of the most prominent is Git.

If you want to learn Git well, check out this Git tutorial.

www.bilibili.com/video/BV1iv…

Iv. Database

Java internship is no more than adding, deleting and checking. Don’t have too many illusions. Basically, any one’s internship experience starts from CRUD. If you want to learn MySQL, it is recommended to see the following set

www.bilibili.com/video/BV1fx…

B station is a classic video tutorial, good reviews, cover all the knowledge of MySQL

With this set of one-two punch, I think I have no problem finding an internship.

This is also a skill point that must be mastered by a Java backend programmer.

5. Web front end

Although as a Java backend development Coder, but in the face of a complete project, and front-end has an indispensable relationship.

Simple front-end knowledge is still needed.

Also, not all companies differentiate between front and back ends, full stack engineers are obviously better.

Basic Front-end technology (HTML/CSS/JavaScript)

HTML:

www.bilibili.com/video/BV11t…

CSS:

www.bilibili.com/video/BV1tt…

JavaScript:

www.bilibili.com/video/BV1Ft…

In addition, I recommend some tutorials on the knowledge you will encounter

Linux Basics (for web servers)

www.bilibili.com/video/BV1Li…

Vue.js (the most accessible front-end framework)

www.bilibili.com/video/BV1q5…

Six, JavaWeb

After the Web phase, it’s JavaWeb.

I recommend these two sets of videos, different versions, just follow the video

JavaWeb【IDEA version 】

www.bilibili.com/video/BV1Yz…

JavaWeb [Eclipse Classic]

www.bilibili.com/video/BV18z…

Seven, framework,

To get a Java internship, you need to know a little bit of the Spring framework, not a lot of it. It helps to know one framework, especially Spring Boot. Because if you don’t know the stuff, you’re not going to be able to do the project.

The main contents involved are:

Spring
Spring MVC
MyBatis
Spring Boot

For more information about SSM (Spring+Spring MVC+MyBatis), see the following video.

www.bilibili.com/video/BV1Ug…

To learn more about Spring Boot, watch this video below

www.bilibili.com/video/BV1pK…

Learn SSM + Spring Boot, you can start practical projects, like GitHub VHR and mall, are good practice projects, highly recommended.

8. Internet distributed technology

At this time your level is still only left on the simple use of the framework, want to further study, but also to find some framework source code, in-depth understanding.

In addition, you should be familiar with design patterns at this point and need to read some books on coding optimization to improve your coding skills.

You can learn distributed architecture, microservices and other techniques to improve yourself.

As our business more and more and more important, monomer architectural patterns have been unable to corresponding large-scale application scenarios, and the system must not exist in a single point of failure cause the overall is not available, so only vertical or horizontal split business system, make them form a distributed architecture, the use of distributed architecture to eliminate redundant system of single point of failure, This improves the availability of the entire system.

At the same time, the module reuse degree of distributed system is higher, the speed is faster, the expansibility is higher, which is the essential link of large projects.

Microservice architecture introduction strategy — For traditional enterprises, they can consider introducing some appropriate microservice architecture principles to transform existing systems or create new microservice applications at the beginning, and gradually explore and accumulate microservice architecture experience, rather than fully implement microservice architecture.

Since has stepped into the Internet circle, become a member of the programmers, we must uphold the concept of “always learning”, often update their own technical library, for professional Java programmers really not exaggerating!