/**
 * Casting example, with issues
 * @author gtowell
 * Created: Sep 2020
 */
public class Caster {
    /**
     * Define a class that exists only within Caster.
     * We will do this a lot this semester.
     * Note that this class does exactly nothing beyond Object
     */
    private class A {} 
    /**
     * Another class only within Caster.  This one extends A!
     */
    private class B extends A {
        /** A private variable.  Note that this is only in B, not A */
        private int bvar;
        /** A constructor, sets the value of the private variable. */
        public B() { bvar = 1; }
    }
    public void tester() {
        A a = new A();
        B b = new B();
        A aa = b;
        B bb = (B)a;
    }
}