How can i open a new class on solo learn java compiler

Question

Help me in creation of a new class

Answer 1

What does open mean? Create or instantiate?

Answer 2

add all classes to one source in Sololearn

public class Program {
public static void main(String[] args) {
NewClass aStore = new NewClass();
System.out.println(aStore.getA() );
}
}
class NewClass {
int A = 100;
int getA(){return A;};
}