accessing members of one class inside another in java

save below 3 classes in 1 file
name like  "name.java" without quotes
================================================
class sample
{
int a=100,b=200;
void funA()
{
System.out.println("i am in A function");
}
void funB()
{
System.out.println("i am in B function");
}
void funC()
{
System.out.println("i am in C function");
}
}


class demo1
{
public static void main(String args[])
{
sample s=new sample();
System.out.println("a :"+s.a);
System.out.println("b :"+s.b);
s.funA();
s.funB();
s.funC();
}
}


class demo2
{
sample s=new sample();
public static void main(String args[])
{
double p=12.5,q=13.5;
demo2 od=new demo2();
System.out.println("a :"+od.s.a);
System.out.println("b :"+od.s.b);
od.s.funA();
od.s.funB();
od.s.funC();
}
}