Skip to ContentGo to accessibility page
OpenStax Logo
Introduction to Computer Science

Labs

Introduction to Computer ScienceLabs

Labs

1 .
Work through the “Hello, World!” Java tutorial to learn how to program Java to write a sentence to the screen. Start Exercise to cross reference the tutorial with the program. Find the online IDE Replit and establish an account. Research how to write “Hello World” to the screen in C++ and Python. Enter the code in Replit and write a report on your experiment pointing out some of the key concepts that you learned.
2 .
C++ has the concept of libraries of container classes, and both Java and C# have similar libraries of collections classes. These contain various types of data structures. We have examined the array; however, the array has limitations. Learn more about the container and collections classes, and look for examples of the patterns of data they are designed to represent and support. Contrast the various offerings with the plain array. Catalog the similarities and differences between the concepts in these three languages. Which of these libraries do you prefer? Why?
3 .
Study the most popular API library packages which enable multithreading for the languages of C, C++, and Java. In each of these languages, can you describe how multithreading works? Out of the routines you’ve learned so far, which of them are safe for multithreading? Which are not? Can all routines be made thread-safe?
4 .
WebAssembly is a new assembly programming language intended to execute high-performance code in the browser. Investigate the language features, and write a summary of the reasons for its use and the possible benefits and disadvantages for employing it for a simple web application.
PreviousNext
Order a print copy
Citation/Attribution
Reuse and redistribution of this content in digital or print format:
  • This book may not be used in the training of large language models or otherwise be ingested into large language models or generative AI offerings without OpenStax's prior written permission.
  • This book uses the Creative Commons Attribution-NonCommercial-ShareAlike License, which means that you can reuse and modify the material only for noncommercial purposes, must attribute OpenStax, and must distribute any derivative works under the same license.
  • Any commercial printing of this textbook, including using a local or custom printer, must be approved by OpenStax, and proper citation provided.
  • OpenStax-copyrighted images, activities, assessments, and similar components of this book are subject to the same licensing – CC-BY-NC-SA. They can be used for noncommercial purposes with attribution. Commercial use requires permission.
  • Permission requests: Anyone who intends to incorporate this content (including text, images, and other components) into large language models, use it in AI offerings, use it commercially (including in print), and/or has questions about another use case is welcome to complete our reuse request form.
Attribution information
  • If you are redistributing all or part of this book in a noncommercial print format, then you must include on every physical page the following attribution:

    Access for free at https://openstax.org/books/introduction-computer-science/pages/1-introduction

  • If you are redistributing all or part of this book in a noncommercial digital format, then for every page that includes OpenStax content, you must license the derivative work under the same CC-BY-NC-SA license as the original, and include on every digital page view the following attribution:

    Access for free at https://openstax.org/books/introduction-computer-science/pages/1-introduction

Citation information

The information below includes the information needed to generate citations in most major styles (APA, MLA, etc.); you must reformat and organize the information as needed to fit the requirements of the style. Use the information below to generate a citation. We recommend using a citation tool such as this one.

© Apr 23, 2026 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike License. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo, and Rice University name, and Rice University logo trademarks, or wordmarks are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University.