Java: How to get a class object of the current class from a static context?

Question

I have a logging function that takes the calling object as a parameter. I then call getClass().getSimpleName() on it so that I can easily get the class name to add to my log en

Answer 1

querying the stacktrace maybe worty for your problem. You have 3 possible approachs.

Exception#getStackTrace()

Just create an exception instance and get the first frame:

static String className() {
    return new RuntimeException().getStackTrace()[0].getClassName();
}

Thread

Using Thread is even easier:

static String className2() {
    return Thread.currentThread().getStackTrace()[1].getClassName();
}

these two approachs have the disadvantage that you cannot reuse them. So you may want to define an Helper class for that:

class Helper {

    public static String getClassName() {
        return Thread.currentThread().getStackTrace()[2].getClassName();
    }
} 

now you can obtain your class name programmatically, without hardcoding the class name:

public static void log(Object o, String msg){
    do_log(Helper.getCClassName() + "  " + msg);
}