Tis also no output

Question

//Methods with Reference arguments
class A
{
int x;
void add()
{
System.out.println(" X : "+x);
}
}
class Sample
{
A o1;
void test(A o2)
{
this.o1=o2;
o2.add();
}
}
class Demo3
{
public static void main(String aa[])
{
A ss1=new A();
ss1.x=5000;
new Sample().test();
}
}

Answer 1

your version should not even compile.
try
new Sample().test(ss1);

Answer 2

Roland's correct. Output is 5000 with the change.

Answer 3

ref is passed in tis method ah roland