Creating variables of different types. Converting between variable types. Using 3rd party libraries. Creating your own data types. Arrays, hash tables and dates.
- HashMap is a collection - you can reference a value using a key. The keys are often strings.
- ArrayList is like a normal array but it can grow and shrink.
while, for, foreach, if, return, break and other constructs
Input and output
options for reading and writing data to files and to databases network access.
Graphic User Interface
Buttons, text boxes that users can see and control.
Using an accumulator, recursion, function composition.