Java: Class Methods Part 2
Also see Part 1 about Methods
Overloading Methods
- Have multiple methods of the same name but have different parameters
either in number or type.
Example
Overriding Methods
- This is the way in which methods that are inherited from a classes
ancestors in the inheirantence chain are replaced or over-ridden
by new methods.
- Even if you have created a method that overrides a superclass's method,
you can still call this superclasses method by using the following:
super.method();
Exercise
Constructor Methods
- optional method, a default exists that does nothing.
- Special Kind of method called when creating an instance of a class
that may perform any variety of operations including initializing variables,
creating other objects, etc.
- Always have the same name as the class.
- Can have multiple constructors (overloaded) that take different inputs
and can perform different operations.
- Has NO return type.
- If you write a class with a constructor with parameters and you intend
to possibly use it as a Pareny class you need to make sure you also
write a constructor with NO paramters. This is needed because: If the
child class is defined with no constructors, it will automatically call
super() which is the Parent's constructor with no arguments.
- Inside of a constructor, if you need to call the parents constructor,
you can do so by simply adding the following line inside of your constructor:
super(arg1, ....);
Exercise
Finalizer Methods
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