(Learning memo) Java 2nd grade measures: Question 1 Main points (knowledge)

Java Self-learning notes

Question 1 Summary of points

Oya　 -Inheritance-> Ko (subclass of Oya) -Inheritance-> Mago (subclass of Oya)

--this can be used in both superclasses and subclasses

--java.io.FileOutpuStream class A subclass of the java.lang.Object class

--Java is "multiple inheritance" NG! !! Subclasses can inherit the attributes and operations of superclasses The superclass reference variable Subclass objects can be assigned!

--------- TBE -------------

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