Easy Chart subplot titles

Does that mean that reading this page:
https://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/plot/CombinedDomainXYPlot.html all the stuff listed in https://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/plot/Plot.html will work, too?

This is what you mean by inherited?

Yes - at the very top, you can see the direct hierarchy - and just below that, you see the list of ‘All implemented interfaces’.