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 Java specification states you can only have at most one public class per file. In this case, the class name should match the file name. All non-public classes are allowed to have any name, regardless of the file name.