OOPS

access levels for object

• Abstraction : https://www.geeksforgeeks.org/abstraction-in-java-2/
• Encapsulation : https://www.geeksforgeeks.org/encapsulation-in-java/
• Inheritance : https://www.geeksforgeeks.org/inheritance-in-java/
• Polymorphism : https://www.geeksforgeeks.org/polymorphism-in-java/