Java Programming Basics with Examples

Abstract Class in Java An abstract class is a class that is declared using the abstract keyword. It is used to achieve partial abstraction in Java. Key Points Any class declared with the abstract keyword is called an abstract class. An abstract class can contain:             ✓Abstract methods             ✓Concrete methods An abstract class cannot be instantiated (object creation is not allowed). If a class contains at least one abstract method, then the class must be declared abstract. An abstract class does not support multiple inheritance. An abstract class supports partial abstraction. Abstract Method An abstract method is a method that:                 ✓Does not have a method body                  ✓Ends with a semicolon (;) Abstract methods only provide method declaration, not implementation.             abstra...