I'm not sure that I should be worried that this is outdated or not ...
The age of the textbook will be my first problem, and Java programming for children, parents and grandparents is the copyright of 2004. This is a decent year for the starting Java tutorial as it will be compatible with the latest version of Java (it just won't cover anything new, but you won't need any of this when you are just starting out).
In addition, the links to Windows 98 in the document make it sound as if they expect the reader to have a new operating system. For example, on page 18 of the PDF we see the following:
If you have an old computer with Windows 98 ...
Thus, the document is good for everyone with Windows 98, but they assume that Windows 98 is an old computer (the author gives special recommendations for Win98 users who no longer need anyone). The document also mentions Windows XP, for example. when the author provides a screenshot from his laptop with Windows XP, so the author does not assume that all readers use Windows 98.
Ultimately, I would not worry about the age of the document you are reading, or about links to Windows 98. If it helps you, keep reading. :)
As with other Java tutorials, I will describe the other answers here. Good luck.
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