1️⃣15.1 Abstract Classes2️⃣15.2 Abstract Methods3️⃣15.3 Interfaces4️⃣15.4 Practice🎖️Ch. 15 Quiz Previous ChapterCh. 14 Exception Handling & File I/O Next ChapterCh. 16 LinkedLists ⚖️Copyright © 2021 Code 4 Tomorrow. All rights reserved. The code in this course is licensed under the MIT License. If you would like to use content from any of our courses, you must obtain our explicit written permission and provide credit. Please contact firstname.lastname@example.org for inquiries.