Uploaded this to share with IT Elective 1 classmates. 
I searched for it in Google, and I’m lucky to find this free e-book of Head First Java – Second Edition. I can’t remember where I got it from though. It’s been days, and I got a very poor memory.
And by the way, I used A-PDF Split to split the e-book into separate chapters for our convenience. The file I downloaded is only one PDF file which had 690 pages. It lags in slow computers. It’s also better off being separated by chapters for ease of reading, right? So, there. 
I hope this helps us.
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