__Topics

• Interface
  • Fields
  • Methods (abstract, static, private, default)
  • Empty and Marker Interface
• Abstract
  • Constructor
  • Interface vs Abstract class
  • Abstract class and method
  • Abstract class implements an Interface
• Final
  • Class
  • method
  • variables
  • fields
  • arguments
• Annotations
  • @Override
  • @Deprecated
  • @SuppressWarnings
  • @FunctionalInterface
  • @SafeVarargs
• Access Modifiers
  • public
  • private
  • protected
  • package private (default)
• Static
  • field
  • methods
  • class
  • block
• Data types
  • primitive
  • non primitive
  • default value
  • literals
  • instanceOf
  • Upcasting, Down casting
  • Stack and heap memory
• Wrapper Class
  • Autoboxing and Unboxing
• Inheritance
  • Overriding
  • Multiple Inheritance using interfaces
  • hiding
  • diamond problem
• this and super
  • calling constructor
  • access field and methods
• String
  • equals vs ==
  • String pool
  • compare
  • String vs StringBuilder vs StringBuffer
• Exception handling
  • try catch finally
  • exception vs errors
  • checked exception vs unchecked exception
• Collection
  • Array vs ArrayList
  • for(int x: list)
• Streams
  • terminal vs intermediate operators
  • map()
  • flatMap()
  • filter()
  • collect()
    • converting to list
    • grouping and converting to map
  • sorted()
    • comparator
  • distinct()
  • limit()
  • skip()