Java Basics [Completed]

Hello World; Variables; Data Types; Operators; Input/Output; Expressions & Blocks; Comments; If...Else; Switch Statement; For loop; For-each loop; While loop; Break Statement; Continue Statement; C#Arrays; Multidimensional Array; C# Copy Array; Class and Objects; Methods; Strings; Access Modefiers; this keyword; final keyword; Recursion; instance of Operator; Classes and Objects; Class Methods; Constructors; Packages/API; Inheritance; Polymorphism; Inner classes; Abrstraction; Interface; Enums; User Input; Date; Array List; Linked List; Hash maps; Hash set; Iterator; Wrapper classes; Exceptions; Regular Expressions; Threads; Lambda; File Handling; Create and write files; Read files; Delete files;