Java Learning Notes

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Extends integration
Final constant
ABSTRATCT Abstract classes cannot be instantiated directly
Inheriting abstract classes, you must override the abstract method
Interface interface
Implements implementation interface interface can be implemented when you do not know how to handle the sub-method, the edge uses the interface
can inherit an abstract class and implement an interface at the same time
Interfaces can inherit multiple classes
Generic type <T>
A wildcard character?

Java Learning Notes