java method is called to get the current information (to be called the method of that class that line)

public void testMethod(){
        
        Test1 t1 = new Test1();
        t1.my();
        
    }
    
    public static void main(String[] args) {
        Test t = new Test();
        t.testMethod();
    }
    
     class Test1{
        public void my(){
            
            
            String  tag = this.getMyGrandpaStackTrace();
            System.err.println(String.format("调用我的人是:%s", tag));
        }
         
         
         public String  getMyGrandpaStackTrace(){
                
             StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
                 StackTraceElement father = stackTrace[1];
                StackTraceElement log = stackTrace[2];
                String tag = null;
                for (int i = 1; i < stackTrace.length; i++) {
                    StackTraceElement e = stackTrace[i];
                    if (!e.getClassName().equals(log.getClassName())) {
                        tag = e.getClassName() + "." + e.getMethodName();
                        break;
                    }
                }
                if (tag == null) {
                    tag = log.getClassName() + "." + log.getMethodName();

                }
                System.err.println(String.format("My father  is %s.%s", father.getClassName() ,father.getMethodName()));
                System.err.println(String.format("My grandpa is %s",tag));
                return tag;
    
            }
        
    }