Which of these method of Object class is used to obtain class of an object at run time?

The method of the Object class used to obtain the class of an object at run time is the getClass() method. Here are the steps to use it:

1. First, you need to have an instance of a class. For example, let's say we have a class named "MyClass" and we create an instance of it:

MyClass myObject = new MyClass();

2. Now, to get the class of this object at runtime, you use the getClass() method:

Class<?> clazz = myObject.getClass();

3. You can then use this Class object to get information about the class, such as its name:

String className = clazz.getName();

So, the getClass() method is used to obtain the class of an object at runtime.