// "pass by reference" DIS
// How do you "pass an object"? technically, by value, but what you're
// really passing the reference value, which is the address of the
// object. A call to the method stores the address of the object in
// the formal parameter of the method.
    
class Data1 {
    int k;
}

class Test1 {
    void change(Data1 x) {
	System.out.println("Before changing: " + x.k);
	x.k++;
	System.out.println("After changing: " + x.k);
    }
}

public class pass1 {
    public static void main(String[] args) {
	Test1 t = new Test1();
	Data1 d = new Data1();
	d.k = 1;
	System.out.println("Before passing: " + d.k);
	t.change(d);
	System.out.println("After passing: " + d.k);
	
    }
    
}

/* output:
Before passing: 1
Before changing: 1
After changing: 2
After passing: 2
*/