Core Java. So in the core java

1) Core Java 

In this particular Java Developer roadmap, the first thing you need to learn is Core Java. So in the core java, you need to learn the following major topics:

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  Data Types and Variables
  
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  Features and Architecture
  
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  Operator and Expressions
  
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  String Class
  
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  Conditional Statements and Loops
  
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  OOPs Concept in Depth
  
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  Multithreading
  
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  JAVA IO Streams
  
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  Collection Framework
  
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  Java 8
  

2) Advanced Java

After learning Core Java you need to learn the Advanced Java concepts. In this particular Advanced Java, you need to learn the following topics

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  Design Pattern
  
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  JVM
  
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  Threads
  
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  Servlet and JSP
  
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  Concurrent Programming
  
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  Garbage Collection
  
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  Best Practice and Code Structure
  

In Advanced Java, you don’t need to learn everything in detail but you just be aware of all the above things and how those are working. And whenever you are working on these particular things you can read about them and you can implement them in your project. 

3) IDE’s

Once you are well versed with the core and advanced java you should be able to code java applications. So for that, you should know any of the following IDE’s 

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  IntelliJ IDEA
  
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  Eclipse
  
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  Spring Tool Suite
  
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  VS Code
  

You must be aware of the different shortcuts for your IDE whichever you are preferring so that it will optimize your workflow and increase your productivity for developing applications.