ArrayLists in java.
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Some super awesome coding books:
Head First Java: https://amzn.to/3CQFURl
Python Crash Course, 2nd Edition: https://amzn.to/3Tx2KEa
PHP & MySQL: Server-side Web Development: https://amzn.to/3ETvbIs
The C++ Programming Language: https://amzn.to/3CWhZRi
C Programming Language: https://amzn.to/3Hecuje
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Video on the difference between primitives and objects:
https://youtu.be/8zvonRIYu1Q
