My first Android app

Source: Internet
Author: User

Notes of the Day

rewrite (Override)

Is that the subclass accesses the override of the parent class method in the promised parent class. The return value of the row parameter cannot be changed. That is, the shell does not change, the core rewrite!

Benefits: Subclasses can customize their behavior according to their own needs;

Animal B = new Dog ();//can be called to subclass overridden method

Note: As you can see in the example above, although B belongs to the animal type, it runs the Move method of the dog class.

This is because in the compile phase, only the reference type of the parameter is checked

Use the Super keyword when you need to call the overridden method of a parent class in a subclass

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My first Android app

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