How to track selected option from Combo Box 1 and show corresponding option on combo box 2 in java

Question

i haven't touched java for almost 6 years just trying to finish this side project, i'm trying to make the jComboBox2 to show specific company positions stored in the database based from the selected company from jComboBox1, i know ActionListener just couldn't get it right, i just have to make it dynamic that whenever a different company is selected from combo1 the corresponding company positions should show on combo2, here's sample code:

public class NewMessage extends javax.swing.JFrame{

    /**
     * Creates new form NewMessage
     */
    public NewMessage() {
        initComponents();
        showCompany();
        showPosition();
        
    }
    
    public void showCompany(){
        try {
            String jdbcUrl = "jdbc:sqlite:/client.db";
            Connection connection = DriverManager.getConnection(jdbcUrl);
            
            String query = "SELECT * FROM contacts";
            Statement statement = connection.createStatement();
            ResultSet result = statement.executeQuery(query);
            
            while(result.next()){
                String company = result.getString("company");
                jComboBox1.addItem(company);
            }
        }catch(SQLException e) {
            JOptionPane.showMessageDialog(this, e.getMessage());
        }
    }
   
    
    public void showPosition(){
        try {
            String jdbcUrl = "jdbc:sqlite:/client.db";
            Connection connection = DriverManager.getConnection(jdbcUrl);
            
            String companyName = jComboBox1.getSelectedItem().toString();
            
            String query = "SELECT * FROM contacts WHERE company='"+companyName+"' ";
            Statement statement = connection.createStatement();
            
            ResultSet result = statement.executeQuery(query);
            
            while(result.next()){
                String positions = result.getString("position");
                jComboBox2.addItem(positions);
            }
        }catch(SQLException e) {
            JOptionPane.showMessageDialog(this, e.getMessage());
        }
    }