This repo contains => 1 Static and instance (variable and function) 2 Encapsulation, Polymorphism, Inheritance and Abstraction. 3 Constructor, Init and Static block 4 this and super 5 Abstract classes and Interfaces 6 Nested classes(Static and Non Static) 7 Exception Handling 8 try, catch and finally 9 Automatic Resource Handling 10 throw and throws 11 String Handling 12 AWT (Delegate Event Model) 13 Applet 14 Threading 15 Synchronization 16 IO Stream 17 Serialization and Externalization 18 Clonning, Vargs and Wrapper classes 19 Collections 20 JDBC and many more
Start from Anki1 and go to last you will sure learn most of core java concepts.