Abstraction is a general idea, for example, it is good to plan for the future. Concrete examples are specific. You could describe how you put aside $60 per month, while working for an insurance company, and how this eventually added up to $3000, which you then used to pay for dental work that you needed when one of your teeth broke while you were chewing on a spare rib.
Concrete examples are specific instances or items that can be easily observed or experienced in the physical world. Abstract examples, on the other hand, are conceptual ideas or representations that are not tangible but are more theoretical or philosophical in nature. Concrete examples provide tangible evidence or illustrations, while abstract examples convey concepts or principles.
I think you are asking the difference between abstract nouns and concrete nouns. A concrete noun is something that can be seen or touched like a cat or a tree. An abstract noun is something more intangible like happiness or peace.
There is no difference with method declaration and implementation between abstract and non-abstract classes. You do the exact same thing when writing a concrete method in either an abstract or non-abstract class.
One is abstract and the other is concrete (not literally, of course).
concrete imagery is where the implicit reticence of an empirical verb past/present participle of a understandable colloquial is undoubtedly infallible. abstract is the contrary.
The difference between abstract and summary is that an abstract is a short from of a summary.
Concrete here reefers to "things", physical objects (which can be touched). And "abstract" refers to concepts.
Concrete thinking is more on the surface, something that you point out or think of is more obvious. Abstract thinking is something more under the surface, something that is deeper in thinking, like looking at a piece of art, pointing out the colors would be concrete, pointing out the feeling and emotion behind it is more abstract. Hope that helps.
Blind Concrete
The noun divide is an abstract noun as a word for an important difference or disagreement between two people or groups.The noun divide is a concrete noun as a word for a dividing ridge of between drainage areas, a ridge of land.The abstract noun forms for the verb to divide are divider, division, and the gerund, dividing.
The noun "system" is an abstract noun because it refers to a concept, idea, or structure that is not physical or tangible.
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