What are the shortcuts for learning Java?

Ok so let me tell you something, one should learn the concepts of a programming language like if you know what Object Oriented Programming is then you can implement it in any programming language the only syntax will differ from language to language.

As you've asked the shortcuts

1. Start with basic
- Basic Syntax
- Basic Datatypes
- Operators
- Loops
- Conditional Statements
- String, Arrays
- File handling and Exceptions Handling

2. Move to Object Oriented Programming
- Classes
- Objects
- Constructor
- Inheritance
- Polymorphism
- Abstraction
- Encapsulation
- Interface and Packages

That's all you've knowledge of Java Programming language. Now if you want you can now learn Data Structures and Algorithms.