class DangerousInteger {
    int mydata;
    public DangerousInteger(int x) {
        mydata = x;
    }
    public int getVal() {
        return mydata;
    }
    public void setVal(int x) {
        mydata = x;
    }
}
public class Ex3 {
    public void foo(int a, DangerousInteger b) {
        a = 3;
        b.setVal(3);
    }
    public static void main(String[] args) {
        int x = 2;
        DangerousInteger y =  new DangerousInteger(2);   // no auto-boxing!!
        Ex3 thing = new Ex3();
        thing.foo(x,y);
        System.out.println("x is "+x+"    y is "+y.getVal());
    }
}