[kiran2710]

Classes Main and Demo will be in the default package.
Here the default package in the sense, its the folder where the java file will reside.
E.g. Here I placed the file in c:\demopack folder and compiled. As a result the classes will be stored in the demopack.
The scope\visibility of this classes will be in demopack.

class Demo
{
int a=5;
void print()
{
System.out.println(" a is: "+a);
}
}
class Main
{
public static void main(String args[])
{
Demo d=new Demo();
d.print();
}
}