29) Java StringBuilder and Character Class | Java with Ali

This video looks at a simple application using StringBuilder class append, insert and delete examples and the Character class static methods like digit and forDigit to convert a character to digit and a digit to character. Remember boxing that we spoke about previously - Java automatically converts these char literals to Character objects - a process known as autoboxing. We used boxing already when we used the Integer class on the primitive int type.

REMEMBER:
API - Application Programming Interface.
DAU - Define, Assign, Use.
IDE - Integrated Development Environment.
Composition design = more flexibility.
Inheritance uses the keywords extends (like it extends your family by inheriting members of the superclass into the subclass), super and override.
Abstract = not planning to create a new concrete object i.e. it cannot be instantiated which means you cannot create a new object from it.
Static variable = sharing a variable across multiple objects i.e. in a computer game every player needs to know how many enemies are on screen.
SSI - Sequence, Selection, Iteration... LIFO - Last In, First Out and more acronyms to follow!
Access modifiers:
The 3 P's - for access modifiers Private, Public and Protected. We can use protected to allow a subclass access to a superclasses members but this is not recommended as it gives access to all classes within that package AND it allows direct access to manipulate the data of the superclass. Use of the principle of least privilege is recommended, for example, using accessor (getter) as well as mutator (setter) methods instead of changing to protected is also recommended.

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Like any language, it takes practice, with a computer language the feedback you get will come from your computer and so we're going to make sure you speak the right language to interact with it correctly and make it do what you want it to do! Let's make some applications together!

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*** Thank you for watching and all your support ***
Dankeschön, tschüss und auf Wiedersehen!
Eure Ali :)
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