What Is Abstraction In Java?

Abstraction is nothing but data hiding . In java we will
provide the object to users then they will use the object's but they doesn't
know what is happening the behind . This is called abstraction. Abstraction
uses in order to do some works easily.

For example, you have a abstract class fruit. And

fruit has some methods one of which has to be abstract

           The technique of choosing common features of objects and methods is known as abstracting. It also involves with concealing the details and highlighting only the essential features of a particular object or a concept. A Java programmer makes use of abstraction to specify that a couple of functions form the same kind of task and can be merged to perform a single function.

           Abstraction along with two other techniques, information hiding and encapsulation are the most significant techniques in software engineering. All of these three functionalities are known to reduce complexities in processing and programming.  Java, developed by Sun, is an object oriented programming language that can work on different independent platforms. The Java abstraction is clearly and concisely explained with the help of examples in cnx.org/content/m11785/latest//.
I am sure this detailed piece will give you a clear idea about how abstraction is incorporated in Java.

Getting only the properties from one object o create one or more than one object.

Showing essential features and hidding the non essential is know as abstraction

Abstraction is nothing but a class or an object acquiring all the features of a particular class or method.