java代码获取当前类类名、方法名

Description

Below I present you two different ways toget the current Class:

• UsingThread
• UsinggetClass()

The simplest way to get the name of the class where your code isbeing executed in is using the getClass() methodpresent in every java object. Like here:

String clazz = this.getClass().getName();

This works only if executed in an Object, namely an instanciatedclass. If you try to execute the code above ina static method.It won't work. Even the keyword this ismeaningless in a static method.

Also, the class returned by the above method may actually be asubclass of the class in which the method is defined. This isbecause subclasses inherit the methods of their parents; andgetClass() returns the actual runtime type of the object. To getthe actual class in which a method is defined, use the method belowalso.

In a static methodyou can instead use the following:

String clazz = Thread.currentThread().getStackTrace()[1].getClassName();

Which uses the static methodgetStackTrace() toget the whole stacktrace. This method returns an array, where thefirst element (index 0) is the getStackTrace() you called and thesecond element (index 1) is the method your code is in.

A similar trick can be used to find out the name of the methodcurrently executed:

String method = Thread.currentThread().getStackTrace()[1].getMethodName();

It's exactly the same principle, just you dig out the name of themethod instead of the class.

 

The code

package org.wikijava.reflection;
  
public class MethodName {
         
        public static void main(String[] args) { 

 MethodName methodName = new MethodName();
  
          String clazz = Thread.currentThread()
                                .getStackTrace()[1].getClassName();

                String method = Thread.currentThread()
                                .getStackTrace()[1].getMethodName();

                System.out.println("class name: " + clazz
                                + " Method Name " + method); 
 
                methodName.anotherMethod();
        }
  

  private void anotherMethod() { 

               String clazz = this.getClass().getName(); 

                String method = Thread.currentThread()
                                .getStackTrace()[1].getMethodName(); 

                System.out.println("class name: " + clazz
                                + " Method Name " + method);
 
        }
 
}