One of the most disappointing limitations of IntellIJ 14.1.5 is the lack of F1-Help for the Java API.
For example, in the following line, if I highlight Thread and press F1 (the usual help function key in most modern IDE's), I expect it to take me to the online (or local if I choose that option) documentation for the Thread class:
Thread t4 = new Thread(someobject);
Even if F1 help doesn't work, I should be able to right-click on Thread and choose Help.
Either way, it should be possible to use a modern, professional-level IDE to navigate to online (or local) help for the Java API.