VS && outer class inner class abstract and abstract method

Not enough time to organize

java class internal (inner class) Explanation

Some little about Java Summary - inner classes, outside of class

Relationship between the inner outer class java class

java: class differences and connections inside and outside the class

java classes of external and internal classes

Understanding of the abstract methods of java

Java abstract classes / abstract method

What is an abstract class? What is an abstract method?

Abstract classes and abstract methods

Java abstract class