Consider the following IntObject and IntObjectTest classes.

public class IntObject
{
    private int num;
    public IntObject() // default constructor
    { num = 0; }
    public IntObject(int n) // constructor
    { num = n; }
    public void increment() // increment by 1
    { num++; }
}

public class IntObjectTest
{
    public static IntObject someMethod(IntObject obj)
    {
        IntObject ans = obj;
        ans.increment();
        return ans;
    }

    public static void main(String[] args)
    {
        IntObject x = new IntObject(2);
        IntObject y = new IntObject(7);
        IntObject a = y;
        x = someMethod(y);
        a = someMethod(x);
    }
}

After the main method in the IntObjectTest class finishes execution, what are the values of the num field for the objects referenced by x, y, and a, respectively?