Bit Order Technologies Technical Specialist Interview Questions and Answers

50 mins MCQ test on Java Concepts and Aptitude. Questions were easy but need to solve quickly.

Q1. What are interfaces on Java?
Ans. 
Interfaces in Java are like blueprints for classes, defining methods that must be implemented by classes that implement the interface.
• Interfaces in Java are used to achieve abstraction and multiple inheritance.

• Interfaces can have abstract methods, default methods, and static methods.

• Classes can implement multiple interfaces but can only extend one class.

• Example: interface Shape { void draw(); }

• Example: class Circle imp...read more
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Q2. What are abstract classes in Java?
Ans. 
Abstract classes in Java are classes that cannot be instantiated and may contain abstract methods.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to extend
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Q3. What is the difference between method overloading and method overriding?
Ans. 
Method overloading is having multiple methods in the same class with the same name but different parameters, while method overriding is redefining a method in a subclass with the same name and parameters as in the superclass.
• Method overloading is resolved at compile time based on the method signature, while method overriding is resolved at runtime based on the object type.

• In method overloading, the return type may or m...read more
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