First, have you created the IntClass? and is it in the same package as Exercise14?

Your compiler is not able to find IntClass. So, if you've already created it, then make sure you compile everything all together, like javac *

If you haven't created IntClass yet, here's what it should look like:

public class IntClass
{
private int num;

public IntClass( int num )
{
this.num = num;
}

public int getNum()
{
return num;
}

public void setNum( int num )
{
this.num = num;
}
}