How to call getClass() from a static method in Java?
I have a class that must have some static methods. Inside these static methods I need to call the method getClass() to make the following call:
public static void startMusic() {
URL songPath = getClass().getClassLoader().getResource("background.midi");
}
However Eclipse tells me:
Cannot make a static reference to the non-static method getClass()
from the type Object
What is the appropriate way to fix this compile time error?
Answer
The Answer
Just use TheClassName.class instead of getClass().
Declaring Loggers
Since this gets so much attention for a specific usecase--to provide an easy way to insert log declarations--I thought I'd add my thoughts on that. Log frameworks often expect the log to be constrained to a certain context, say a fully-qualified class name. So they are not copy-pastable without modification. Suggestions for paste-safe log declarations are provided in other answers, but they have downsides such as inflating bytecode or adding runtime introspection. I don't recommend these. Copy-paste is an editor concern, so an editor solution is most appropriate.
In IntelliJ, I recommend adding a Live Template:
- Use "log" as the abbreviation
- Use
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger($CLASS$.class);as the template text. - Click Edit Variables and add CLASS using the expression
className() - Check the boxes to reformat and shorten FQ names.
- Change the context to Java: declaration.
Now if you type log<tab> it'll automatically expand to
private static final Logger logger = LoggerFactory.getLogger(ClassName.class);
And automatically reformat and optimize the imports for you.