Super keyword and final keyword

1,super keywords

1.1 In subclasses, you can use the Super keyword if you want to call the overridden method in the parent class;

1.2 If you want to use member variables that are hidden by the parent class in a subclass, you can use the Super keyword;

1.3 If the subclass is to use the constructor of the parent class, you need to use the Super keyword, and be sure to do so in the subclass's constructor method

The syntax is as follows:

Super ([construct parameter list])

Parameter description:

Constructs a parameter list: an optional parameter that is populated according to the formal parameter declaration of the calling construction method.

2,final keywords

2.1 keywords defined using FIANL cannot have subclasses;

2.2 The method defined using FIANL cannot be overridden by the quilt class;

2.3 Using a final defined variable represents a constant, the constant must be set at the time of definition, and if the constant defined by public static is used, the constant becomes the global constant

2.4 When defining the Finalc length, capitalize the letters of each word

Super keyword and final keyword