What is the difference between Class.this and this in Java

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There are two ways to reference the instance of a class within that class. For example:

class Person { String name; public void setName(String name) { this.name = name; } public void setName2(String name) { Person.this.name = name; }
}

One uses this.name to reference the object field, but the other uses className.this to reference the object field. What is the difference between these two references?