Why does Java allow us to compile a class with a name different than the file name?

Question

I have a file Test.java and the following code inside it.

public class Abcd
{
        //some code here

}

Now the class does n

Answer 1

The reason is the same as for the door plates. If some person officially resides in the office (declared public) his/her name must be on the door tag. Like "Alex Jones" or "Detective Colombo". If somebody just visits the room, talks to an official or cleans the floor, their name does not have to be officially put on the door. Instead, the door can read "Utilities" or "Meeting room".