GitHub regularly scrubs repositories that violate copyright. So, most links you find are abandoned. You’ll download a 100kb file that is actually just a text file saying “Contact me on Telegram for the real PDF” (which is a scam or malware bait).
You don’t always need the PDF. If you want to learn Collections , search for Schildt ArrayList example on GitHub. You will find the code. Use the official Java documentation (free) to understand it. GitHub regularly scrubs repositories that violate copyright
The most reliable way to access the book is through authorized retailers or educational platforms: GitHub regularly scrubs repositories that violate copyright
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