Use the adjective abstract for something that is not a material object or is general and not based on specific examples.
Abstract is from a Latin word meaning “pulled away, detached,” and the basic idea is of something detached from physical, or concrete, reality. It is frequently used of ideas, meaning that they don’t have a clear applicability to real life, and of art, meaning that it doesn’t pictorially represent reality. It is also used as a noun, especially in the phrase “in the abstract” (a joke has a person laying down a new sidewalk saying “I like little boys in the abstract, but not in the concrete”), and as a verb (accented on the second syllable), meaning “to remove.”

Di Bello described the color-splashed works as “ abstract expressionism” with “surrealist” methods.
Aelita Andre has just wrapped up another major show of her abstract paintings and given interviews on her latest inspirations.

A method without body (no implementation) is known as abstract method. A method must always be declared in an abstract class, or in other words you can say that if a class has an abstract method, it should be declared abstract as well. In the last tutorial we discussed Abstract class, if you have not yet checked it out read it here: Abstract class in Java, before reading this guide.
This is how an abstract method looks in java:
As you see this has no body.

Or it can be said as a compliment; it just depends on how you take it.
Basically it can be used sarcastically as another way of saying your art piece sucks..

In the above example, Person is an abstract class which includes one property and two methods, one of which is declared as abstract. The find() method is an abstract method and so must be defined in the derived class. The Employee class derives from the Person class and so it must define the find() method as abstract. The Employee class must implement all the abstract methods of the Person class, otherwise the compiler will show an error.
An abstract class typically includes one or more abstract methods or property declarations. The class which extends the abstract class must define all the abstract methods.

provide information such as the scope of the article, research methodology used, theories applied, or surveys and instruments used.
are standard for most research articles. Although not every article you find in a Walden database will have an abstract.

Abstract classes serve as templates for their subclasses. For example, the abstract class Tree and subclass, Banyan_Tree, has all the characteristics of a tree as well as characteristics that are specific to the banyan tree.
Subclasses extended from an abstract class have all the abstract class’s attributes, in addition to attributes specific to each subclass. The abstract class states the class characteristics and methods for implementation, thus defining a whole interface.

In this example, each card class has its own version of the greeting() method. Each class has a greeting() , but each one is implemented differently. It is useful to put an abstract greeting() method in the parent class. This says that each child inherits the “idea” of greeting() , but each implementation is different. Here is the class definition of the abstract class Card :
An abstract child of an abstract parent does not have to define non-abstract methods for the abstract signatures it inherits. This means that there may be several steps between an abstract base class to a child class that is completely non-abstract.

1. Which of these keywords are used to define an abstract class?
a) abst
b) abstract
c) Abstract
d) abstract class
View Answer
2. Which of these is not abstract?
a) Thread
b) AbstractList
c) List
d) None of the Mentioned
View Answer

At some level, we all think of computers in abstract terms. When we type a document in a word processor, we don’t think of the CPU processing each letter we type and the data being saved to memory. When we view a webpage, we don’t think of the binary data being transferred over the Internet and being processed and rendered by the web browser. We simply type our documents and browse the web. This is how we naturally abstract computing concepts.
An abstraction is a general concept or idea, rather than something concrete or tangible. In computer science, abstraction has a similar definition. It is a simplified version of something technical, such as a function or an object in a program. The goal of “abstracting” data is to reduce complexity by removing unnecessary information.


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