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To understand the use of super, you first know that super is used to call the base class (the parent Class).

1.super. A method or variable of the parent class that invokes the parent class's method or variable in the subclass.

2.super (parameter) is used to invoke a constructor that has the same parameters in the parent class.

The main thing is that super is used to refer to the parent class.

Use of Abstract:

1. The addition of abstractions to a class or method constitutes an abstract class or abstract method.

2. Abstract class only the declaration of a method is not defined, it needs to be overridden in a subclass, and the class containing the abstract method must be an abstract class.

3. Abstract classes can have both abstract methods and non-abstract methods, it is important to note that the subclass of the inherited abstract class must implement all the abstract methods of the parent class, otherwise the subclass is an abstract class.

4. Abstract classes are not able to create objects.

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