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CodeSignal

Java HashMaps in Practice: Revision and Application

via CodeSignal

Overview

Strengthen your understanding and application of hashmap data structures with a focus on counting and aggregation tasks. This course will deepen your comprehension of efficient data access and manipulation using hashmaps.

Syllabus

  • Lesson 1: Introduction to HashMaps in Java
    • Updating Library Catalog Entries
    • Fix the LibraryCatalog HashMap
    • Check if a Book Exists in the Library Catalog
    • Updating and Accessing Elements in a HashMap
    • Updating Book Titles in a Library Catalog Using HashMap in Java
  • Lesson 2: Introduction to HashMaps in Java for Counting Occurrences
    • Optimizing Color Counting Using Java HashMaps
    • Fix the Book Counter Code
    • Counting Returned Books Using HashMap in Java
    • Counting Letter Frequency Using HashMap
    • Counting Book Titles Using HashMap in Java
  • Lesson 3: Data Aggregation Using HashMaps in Java
    • Calculating Average Quantity of Items in a Grocery Store Inventory
    • Finding Minimum Quantity in Fruit Inventory
    • Data Aggregation in a Grocery Inventory Using HashMap
    • Comparing Fruit Inventory to Average Stock Levels
    • Determine the Maximum Count of Any Fruit in Inventory
  • Lesson 4: Applying HashMaps to Real-World Challenges in Java
    • Ensure Book's Available Copies Are Decremented Only When Available
    • Fix the Book Information Display Issue in Library Catalog
    • Managing Library Inventory Using HashMaps in Java
    • Counting Word Frequencies in a String
    • Library Management System Using HashMaps

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