How java compiles creates objects of one class in another class?

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Java

OOP

I am completely new to Java and came across a question that how java compiler creates object of one class in another class. For example :

I have class A as below :

class A{}

//I have class B with main method :

    class B{

        public static void main(String[] args){

        A a = new A();
        
        System.out.println(a);
        
    }
}

Here is the question: I wrote class A in one separate txt file and class B in another txt file. When I compile Class B How compiler knows that class A exists since there is no trace of class A in class B. We are not giving path of Class A and we are not not giving any clue that class A exists. But how java compiler knows and create object for Class A in class B. This might be a silly question but it is not letting me to proceed further without an answer. Thanks in advance.

What I have tried:

I have class A as below :

class A{}

I have class B with main method :

class B{

public static void main(String[] args){

A a = new A();

System.out.println(a);

}
}