Java Interface is nothing but a 100% abstract class and the keyword used to define it is the "interface". Interfaces simply declare all the abstract methods which are to be implemented by the implementing class. Let us know more about interfaces in this Last Minute Java Tutorial.
A Java Abstract Class is nothing but a class with one or more unimplemented methods. These incomplete methods should be implemented by the first Concrete subclass of an abstract class. Let us know more about Abstract Classes in this Last Minute Java Tutorial.
Note: A concrete class is any Java class that defines all methods for readymade use. Objects of a concrete class can be created using the keyword "new".
As Java is an Object Oriented Programming (OOP) language, it supports Inheritance. Inheritance is a process of acquiring Methods and Properties of an existing class into a custom class written by us so that all the inherited code becomes part of our custom Class.
Java is a high-level programming language which is based on C and C++ programming languages. Syntax of Core Java has been adopted from C and C++ languages. Go through tutorials on C before proceeding to Java Tutorials if you do not have basic knowledge about C.
