Program to demonstrates Call by reference

/* Program to demonstrates Call by reference  */

class Sample
{
    int p,q;

    Sample(int x,int y)
    {
        p=x;
        q=y;
    }

    // Pass an Object
    void cal(Sample obj)
    {
        obj.p=obj.p+2;
        obj.q=obj.q-2;
    }
}

class CallByRef
{
    public static void main(String args[])
    {
        Sample s=new Sample(20,10);
       
        System.out.println(" p and q Before call : "+s.p+", "+s.q);
       
        s.cal(s);

        System.out.println(" p and q After call  : "+s.p+", "+s.q);
    }
}