Explain OOP with Java Example | Dataford Interview Questions

Explain OOP concepts with an example program in Java.

Asked in the Technical + HR interview stage. Followed by Java collections framework and SQL query questions.

For the SQL portion, retrieve the four core OOP concepts and their corresponding Java examples from the provided tables.

Output

One row per core OOP concept.
Columns: concept_name, definition, and java_example.
Include concepts in the order: Encapsulation, Inheritance, Polymorphism, Abstraction.
Exclude non-core concepts and concepts without a matching example.

oop_concepts

Column	Type	Description
concept_idPK	INT	Unique identifier for an OOP concept
concept_name	VARCHAR(50)	Name of the OOP concept
definition	TEXT	Short explanation of the concept
is_core	BOOLEAN	Whether the concept is one of the four core OOP concepts
display_order	INT	Required presentation order

oop_examples

Column	Type	Description
example_idPK	INT	Unique identifier for an example
concept_id	INT	Referenced OOP concept
java_example	TEXT	Java code illustrating the concept
review_status	VARCHAR(20)	Review state of the example

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