如何抑制Java类实例上的静态方法？

Question

For example, IntelliJ doesn't show the static sleep method on an instance variable

Thread z = new Thread();
z.sleep(1000); // Eclipse shows sleep as part of z, while IntelliJ do not

It would appear that sleep is part of z variable

How to prevent Eclipse from showing static methods on instance variable? And how to make that a compilation error if at all possible, Eclipse-wise and in command-line?

Answer 1

Not sure you can remove it from options, but you can make Eclipse yield error for that:

Preferences -> Java -> Compiler -> Errors/warnings -> Non-static access to static member -> set as Error.

Answer 2

This is maybe more of a workaround but in the Save Actions ( Preferences->Java->Editor->Save Actions ) you can ask to “ Change non static accesses to static members using declaring type ” which will automatically remove such usage.

Also, Eclipse does not normally suggest static proposals first. If it is the case, you should check your Content Assist settings ( Preferences->Java->Editor->Content Assist ). Especially, ensure that Sort proposals is set to “ by relevance ”.

Answer 3

You can't make it a compilation error from command line, because object has its class, and on this object you CAN invoke static method, which would affect not only this object. Because of this globally influence it's just a better design to invoke static method from class then from object, that's why IntelliJ prevents you from this.