Get the interface name from the implementation cla

Question

Example :

List<String> list = new ArrayList<String>();
//This would give me the class name for the list reference variable.
list.getClass().getSimpleName();

I want to get the Interface name from the list reference variable. Is there any way possible to do that?

Answer 1

Using Reflection you can invoke the Class.getInterfaces() method which returns an Array of Interfaces that your class implements.

System.out.println(list.getClass().getInterfaces()[0]);

To get just the name

System.out.println(list.getClass().getInterfaces()[0].getSimpleName);

Answer 2

Class  aClass = ... //obtain Class object. 
Class[] interfaces = aClass.getInterfaces();