Inheritance of the three major features in java

Characteristics of inheritance: Inherit the attributes and methods of the parent class. Single inheritance (multi-level inheritance) Inheritance in C++ is multiple inheritance

                                                                                                         .                . For example: people can raise dogs; -Team ---- & gt; Player: Overall and part of the relationship. Code is the most common relationship of s Has A

&; Student: Student: Student: Explain that there is a inheritance relationship, whether the relationship is manifested, and there are specific situations to determine.

How to judge whether there is an inheritance relationship between two things: is a Who is who is established. There is an inheritance relationship when it is established.

A:B: How to write inheritance in OC

How to express inheritance relationship in java:

Use keyword: extends to express inheritance.字 Inheritance: Use keywords: EXTENDS

Structure:

Class A EXTENDS B: Class A inheritance B.

                                                                                                                                                               inheritance. 3. Family constructors cannot be inherited.

                    4. When a subclass calls its own constructor, it will call the parameterless constructor in the parent class by default.