How do I find the center class in a method invocation in java

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Java

It is all in java.
So its like I have a java class 'test' with the main method. It makes a variable which is an instance of another class. In its constructer it calls another public method say 'method1'. So in method1 I want to get the name of the class calling it.
It gives me the test class with main method. Than i got the method caller and it was main. But I want the class whose constructor is used. I need this to prevent any other class starting from any point to not have access to this method

What I have tried:

I can't think what to do. I was just stuck what to do