Java Basic Concepts (final, abstract, interface)

/* Final keywords in Java are called Final * Final can declare classes, properties, methods * Classes that use Final declaration cannot be inherited * variables with final declaration become constants, constants cannot be modified * methods that use Final declaration cannot be overridden * abstract A class that contains an abstract method is an abstract class that is an abstract method declaration that is not implemented, and the abstract method must declare the abstract class by using the Abstraction keyword, which, if it is not an abstract class, must override all abstract methods in the abstract class * to define the format: * Class C  lassname{* Attribute * Method * Abstract Method *} * Abstract class cannot be instantiated directly, instantiated through its subclasses * Interface special classes, composed of global constants, and public abstract methods * Interface Format * Interface interfacename{* Global Constants * Abstract methods *} * interfaces must be implemented with the Implements keyword subclasses, and interfaces support multiple implementations * */

Java Basic Concepts (final, abstract, interface)