16 - Multi-Dimensional Arrays
19 - Getters and Return Values
24 - StringBuilder and String Formatting
29 - Public,Private,Protected
31 - Encapsulation and the API Docs
32 - Casting Numerical Values
33 - Upcasting and Downcasting
35 - Generics and Wildcards
37 - Reading Files using Scanner
40 - Runtime vs. checked Exceptions
42 - Reading Files With File Reader
44 - Creating and Writing Text Files
47 - Enum Types - Basic and Advanced Usage
48 - Recursion - A useful trick up your sleeve
49 - Serialization - Saving Objects to Files
5 - A Hello World Program
51 - ArrayList - Arrays the Easy Way
53 - HashMaps - Retrieving Objects via a Key
56 - Using Custom Objects in Sets and as Keys in Maps
61 - Implementing Iterable
62 - Deciding Which Collections to use
63 - Complex Data Structures
7 - Strings - Working With Text
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