By default the font size of Java code text is Eclipse IDE is set to 12. If you wish to increase the font size of the code you see in Eclipse you can do that by the easy below steps,
The Java editor text font is used by Java editors.- Go to Windows (Eclipse if you are using macOS) in Menu bar,
- Now Go to Apperence -> Colors and Fonts
- Now Select: Java Editor Text Font and click on Edit button,
- In the preview sescion you should able to see the font you selected and the size you set and an preview line what is set to the font size you selected,
Menlo 14 The quick brown fox jumps over the lazy dog.
18.
- Click apply and close button.
- The font size should now have changed.

How to increase Eclipse Java Font Size Option
As you can see in the below two images first the font size was default 12 for my code, later I increased it to

Eclipse Default font size - 12

Eclipse Java font increased to 18
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