Basic summary of Java object-oriented programming

1 Methods of inheritance time rewrite:

When a subclass intends to override the method of the parent class, it cannot narrow the access rights of the method, or the compiler does not pass.

2 instantiation of subclasses inheriting parent classes:

When the subclass is in the instance session, regardless of whether the child class is instantiated with parameters, the compiler always calls the parent class's parameterless construction method, and then calls the constructor of the sub-class corresponding parameter;

3 About method Invocation methods:

Static methods that allow only static methods to be called, and instance methods that allow both static and non-static methods to be called directly.



Basic summary of Java object-oriented programming