add a class to a 2d array? Java

I need to create a map which has randomly placed trees and food. For the map i am looking to create a 2d array and then add the trees and food to the array with use of classes, is this possible?

class Tree {
        char tsymbol;
}
class Food {
        char fsymbol;
        
}

The classes only have to have a symbol stored in them for now, which will be the icon which represents the objects on the map.

    public void printWorld (){
                int a;
                int b;
                char[][] map = new char[15][12];

                        for (a=1; a<=15; ++a)
                        {
                                for (b=1; b<=12; ++b)
                                {
                                        foodsymbol.fsymbol = 1;
                                        final String[] items = { };
                                        map[a][b] = 
                                        
                                        //final String[] items = {"F", "O", ". ", ". ", ". ", ". ", ". ", ". "};
                                        //Random random = new Random();
                                        //int index = random.nextInt(items.length);
                                        //System.out.printf(items[index] + "\t");  
                                        System.out.print(map[1][1]);
                                }
                                System.out.printf("\n\n");
                        } 
                }

So far i have this, ignore the comments as that was my previous work. This part is where i am trying to add the objects to the array randomly, however i am having problems accessing the variables or classes in this method.

Thanks in advance for any help:)