Whenever i m declaring class A as public.. it is showing error..why?

Question

class A
{
A(){}
void d()
{
System.out.print("hi");
}
}
class Mcq33 extends A
{
public static void main(String args[])
{
A r=new A();
r.d();
}
void d()
{
System.out.print("bye");
}
}

Answer 1

There must be only one public class in a Java file
https://www.quora.com/Can-we-keep-more-than-one-class-in-a-single-java-file

Answer 2

if I am not mistaken sololearn allow it, maybe sololearn handle the code in different file