Question

Commented code below are the reasons I think the code is not compiling, is this correct ?

class Building {

}


public class Barn extends Building{

    public static void main(String args[]){
        Building build1 = new Building();
        Barn barn1 = new Barn();
        Barn barn2 = (Barn)build1;

        /**
         * Object is not a Building
         * Building is an Object
         */
        Object obj1 = Object(build1);

        /**
         * String is not a Building
         */
        String str1 = String(build1);

        /**
         * Building is not a Barn
         * Barn is a Building
         */
        Building build2 = Building(barn1);
    }

}

Inserted comments are my own. Why the two down-votes, I just didn’t realize the casting syntax was incorrect.

Answer 1

If you are trying to cast, no it is not correct. Casting in Java is done via

   Classname objectname =  (ClassName) src;

If you are trying to construct new objects, you need constructors and and you do it via

   Classname objectname = new Classname(constructorArg1, constructorArg2);

Finally, if you want the String representation of an object, you use

   String string = objectname.toString();