Create ArrayList, add several data to the same array from other classes and print them?

To print the List you can simply use

System.out.println(sc.getSocios());

but this would surely print

[Christofer]

To print one or several elements contained in the List you can use a method:

private static void imprimeList(List<String> array){        
     for (String elemento: array) {
        System.out.println(elemento);
    }
}

This method you can add to your class and print the content of the elements of the list getSocios() that has visibility public

public class CompraVenta {

    private static void imprimeList(List<String> array){        
         for (String elemento: array) {
            System.out.println(elemento);
        }
    }

public void CompraVenta() {
    Lista sc = new Lista();
    sc.getSocios().add("Christofer");
    sc.getSocios().add("Elenasys");
    sc.getSocios().add("Ioana");
    sc.getSocios().add("Constantin");

    //System.out.println("sc");

    imprimeList(sc.getSocios());

   }
}

This would print as a result:

Christofer
Elenasys
Ioana
Constantin

Update :

Defines a class variable

private Lista sc;

Initialize it within your main () method:

sc = new Lista();

In your Purchase () method, just add the elements.

public void Compra() {
    Scanner scan = new Scanner(System.in);
 //   Lista sc = new Lista();
    System.out.println("Ingrese su Nombre");
    String nombre = scan.nextLine();
    sc.getSocios().add(nombre);
    imprimeList(soc.getSocios());
   }
}

The problem is that you are creating a new list instance every time you call the Buy () method, therefore it only contains one element at all times.

Good morning,

ArrayList has its own implementation of toString (). You just have to change the line

 System.out.println("sc");

by:

System.out.println(sc.getSocios());

I've tried it and it already prints [Christofer].

When printing a List either ArrayList or you have to indicate the position you want to show

 public static void main(String[] args) {
        ArrayList<String> lista = new ArrayList();
        lista.add("Paco");
        lista.add("Luis");
        lista.add("Felipe");

        for(int i=0;i<lista.size();i++){
            System.out.println(lista.get(i));
        }
    }

This would show

  

Paco

     

Luis

     

Felipe

This can also be done with Iterator and while but I think that with the for is simpler to see and if the list is of other objects other than String , it is normal that that object have a method toString() to be able to show the attributes of the object we would do.

System.out.println(lista.get(i).toString());