1. What is the difference between JDK, JRE, and JVM?
JDK: Java Development Kit – tools to develop Java apps (includes JRE + compilers).
JRE: Java Runtime Environment – runs Java applications (includes JVM + libraries).
JVM: Java Virtual Machine – executes Java bytecode.
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2. What are the main OOP principles in Java?
Encapsulation: Wrapping data using classes.
Inheritance: Acquiring properties from a parent class.
Polymorphism: Same method, different behavior.
Abstraction: Hiding internal details and showing functionality.
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3. What is the difference between == and .equals()?
== checks reference (memory address).
.equals() checks content/value.
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4. What is a constructor?
A constructor is a special method used to initialize objects. It has the same name as the class and no return type.
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5. What is method overloading and overriding?
Overloading: Same method name, different parameters (within the same class).
Overriding: Subclass redefines a
Otras evaluaciones sobre las entrevistas para el cargo de Junior Java Developer en Java R&D
Me postulé en línea. Acudí a una entrevista en Java R&D en mar 2022
Entrevista
Interview process was ok. It was telephonic round rather than video call.the process was for about 15 min . My SQL database questions were more. Prepare throughly for db questions.
