Can a Method determine its own name

[RobbMN]

I know how to determine the name of the class.

Is there a way for a method to determine its own name?

 

[LFI]

Well, a quick way to make sure it could would be to send the name of the method to the method as a parameter.

I'd have to do a little digging to find out the answer to your specific question though.

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[sedj]

This is how you can do it :

			String methodName = "";
			try {
				throw new Exception();
			} catch (Exception e) {
				StackTraceElement[] ste = e.getStackTrace();
				methodName = ste[0].getMethodName();
			}
			System.out.println(methodName);

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[RobbMN]

Thanks, it works great.

 

[Diancecht]

Isn't there a standard method to do that on Java 1.5?

Cheers,
Dian

 

[sedj]

Not sure ... we still have not moved to 1.5

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[stefanwagner]

Isn't there a standard method to do that on Java 1.5?

Since a method isn't an object, and without a special keyword: no.


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[Diancecht]

So a method is not an object? Wow, now I understand a lot of things ....

Anyway, I was talking from the top of my mind, so I made a mistake. There is a sun.reflection.Reflection class that can give you the caller class, but not the method.

sedj's way is then the only way I can think of.

Cheers,
Dian

 

[stefanwagner]

@Diancecht:
There are some languages, where you can treat a method like an object, which can be very handy.

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[Diancecht]

@stefan: Well, you can also do that in Java, the Method object is out there.

@Rob: I've been thinking about this for a while and still don't understand why you would need to know which method are you running. Could you post an example?

Cheers,
Dian

 

[stefanwagner]

@diancecht: Well - no, that's a different thing. At least it's much less handy, to pass a method to a method.

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[RobbMN]

To Diancecht
I wanted the Class and Method names to be set and available so that I might use them for logging. I did not want to have to hardcode any values. Too cumbersome and error prone when you copy code from one method to another. That way I could use common header code on all my logging statements, such as:

System.out.println(new java.util.Date()+
" <Info> <"+theClassAndMethodName+">"+
...

 

[sedj]

You'd be better off having a static logger class/method if you want that kind of functionality :

public class Logger {
  static void log(String className, String message) {
    String methodName = "";
    try {
	throw new Exception();
    } catch (Exception e) {
	StackTraceElement[] ste = e.getStackTrace();
	methodName = ste[1].getMethodName();
    }
    
    System.out.println("[" +className +"::" +methodName +"] " +message);  
  }
}

Then you can call it like :

Logger.log(this.getClass().getName(), "Hello World!");

However, I really would add that throwing and catching exceptions like I showed would really not be a thing I would be wanting to do too much - its quite an expensive operation.


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[Diancecht]

No way.

From my point of view, you should hardcode the method name. It's not actually a hardcode since the method name is not variable.

Throwing and catching an exception per log line will cause an unnecessary overhead.

Cheers,
Dian

 

[sedj]

I agree Dian - as I stated above. I was just showing the OP a possibilty if they refused to hardcode log statements !

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[stefanwagner]

Well - you could write a macro for your Editor to create a method-template for this stuff, instead of using cut'n'paste.

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[Diancecht]

Ouch, I reposted sedj's advice. I'd read the entire posts before posting

Cheers,
Dian