Preparing for Your Java Interview: The Basics: Technical Questions and Answers (Your Technical Interview Book 4) by KT Lindemann

Author:KT Lindemann [Lindemann, KT]
Language: eng
Format: azw3
Published: 2018-04-19T16:00:00+00:00

Question: What is the Map interface?

Answer:

A Map is a mapping of keys to values. Duplicate keys are disallowed.

The Map interface provides methods for adding, removing, and acting on items in a map:

put

get

Numbers

Question: Describe how numbers are handled in Java?

Answer:

Numbers in Java can either be primitive types or sublcasses of the abstract class Number.

Primitive types include: int, long, float, double

Classes include: Integer, Long, Float, Double

Question: Why might you use a Number instead of a primitive?

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