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JAVA Lang Specs

Access modifiers
- Same class
- Same package and subclass
- Same package and non-subclass
- Different package and subclass
- Different package and non-subclass
Abstract class
- Methods in abstract class
  - Abstract
  - Non-abstract
- Fields in abstract class
  - Non-static and non-final
  - Final
  - Static
  - Static final
- Constructors in abstract class
  - Constructor in abstract class
  - Usage of constructor in non-abstract class
- Abstract class vs interface
Interface
- Fields in interface
- Constructors in interface
- Methods in interface
- Abstract class vs interface
Inner class
- Anonymous inner class
- Local inner class
- Nested inner class
- Static inner class
Sealed class
Static keyword
- Static blocks
- Static variables
- Static methods
- Static class
Final keyword
- Final variables
- Final methods
- Final class
Generic class
- Sigle type
- Multiple types
Transient keyword
Method hiding
- Instance method in subclass
- Static method in subclass
- The method of object
- The method of class type
Super
- Calling superclass constructor
- Access superclass method variable
This
- Constructor overloading
Dynamic Method Dispatch
Enum
- Enum for-loop
- Enum if-else
- Enum switch case