(Basic knowledge related to JAVA 1. What are the general aspects of goal oriented features? Generality means neglecting those aspects of a topic that are irrelevant to the current scheme, so as to pay more attention to the aspects related to the current scheme. A general plan does not understand a comprehensive problem, but only selects a part of it, without some details for the time being. Generality includes two aspects, one is the process, the other is the data. 2. Inheritance: Inheritance is a hierarchical model that connects classes, and allows and encourages class reuse. It provides a way to clearly express commonality. A new class of the target can be derived from an existing class. This process is called class inheritance. The new class inherits the characteristics of the original class. The new class is called the derived class (subclass) of the original class, and the original class is called the base class (parent class) of the new class. Derived classes can inherit methods and instance variables from their base classes, and classes can repair or add new methods to make them more suitable for special needs.JAVA related foundation.doc
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