Selenium WebDriver with Java - Basics to Advanced and Frameworks - Implementing Map Interface

Selenium WebDriver with Java - Basics to Advanced and Frameworks - Implementing Map Interface

Assessment

Interactive Video

Information Technology (IT), Architecture, Religious Studies, Other, Social Studies

University

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

This lecture covers the concept of HashMap in Java, focusing on its implementation and usage. It explains how HashMap stores data in key-value pairs, demonstrates adding and retrieving elements, and discusses handling null values. The lecture also explores converting HashMap to a set and iterating over it using an iterator. Additionally, it explains how to separate keys and values using Map.Entry, providing a deeper understanding of HashMap operations.

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of the 'put' method in a HashMap?

To remove a key-value pair

To sort the HashMap

To update the HashMap size

To add a new key-value pair

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does a HashMap store its data?

As a single array

As a key-value pair

In a list format

In a tree structure

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens when you try to retrieve a value with a non-existent key in a HashMap?

It returns null

It creates a new key

It returns a default value

It throws an error

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of removing a key from a HashMap?

The HashMap is cleared

The key is set to null

The key-value pair is deleted

The value is set to zero

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an entry set in the context of a HashMap?

A set of indices

A set of key-value pairs

A set of values

A set of keys

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can you iterate over a HashMap's entry set?

Using a map function

Using a while loop

Using an iterator

Using a for loop

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of using Map.Entry in a HashMap?

To combine keys and values

To separate keys and values

To sort the HashMap

To remove duplicates

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