How to add items in a dynamically Java combobox?

Question

I have a project in netbeans that uses Java Swing for the interface. I have some data in MYSQL that I would like to show you as soon as the window is created.

Anyway, how can I place items in a Jcombobox dynamically in java?

Answer 1

Since you have no further details, I’ll give you the most general answer possible.

Just use the method addItem

combobox.addItem("Item 1");
combobox.addItem("Item 2");
combobox.addItem("Item 3");

Answer 2

1) first you have to make the connection this can be done in Pure JDBC or JPA

JDBC connection

JPA connection

2) You create a DAO based on one example

CRUD JDBC

CRUD JPA

3) In Your Jframe class you will do the following

public class SeuFrame(){

    public SeuFrame(){
        carregarCombo();
    }

    public void carregarCombo(){

          SeuDAO dao = new SeuDAO();
          List<SuaClasse> list = dao.lista();

          for(SuaClasse item: list){
               seuCombobox.addItem(item);
          }

    }        

}