Java Project Combo Box Code

Example : How to add values to a combo box statically using the Property window.  

Select the Combo Box-'Properties Window'-choose 'Model' and click on browse button(...)-Enter the values - ok.

Example : How to add values to a combo box dynamically using code.  

public UserRegistrion() 
{
     initComponents();       //java's load event        
        
        jComboBox1.addItem("Select Anyone Item");
        jComboBox1.addItem("Item1");
        jComboBox1.addItem("Item2");
        jComboBox1.addItem("Item3");
        jComboBox1.addItem("Item4");
}

Example : How to open a combo box list data automatically when gaining focus on it. 

private void jComboBox1FocusGained(java.awt.event.FocusEvent evt) 
    {                                       
        // TODO add your handling code here:
        jComboBox1.showPopup();
    }

Example : How to remove/clear/erase Combo box data. 

UrfNat1.removeAllItems();

Example : How to load and add data into a combo box automatically from Database when page load occurs. 

try
{
    String sql = "SELECT NAT5 FROM REGISTRATION";
    pst = conn.prepareStatement(sql);
    rs = pst.executeQuery();
    UrfNat1.removeAllItems();
    UrfNat1.addItem("Select Nationality");
    while(rs.next())
    {
        UrfNat1.addItem(rs.getString("NAT5"));
    }
}
catch(Exception e)
{
    JOptionPane.showMessageDialog(this,e);
}

Example : How to Get and Set data to/from a combo box. 

String UrfNat3= UrfNat1.getSelectedItem().toString();

UrfNat1.setSelectedItem(rs.getString("NAT5"));

Example : How to Get data from an Array and add it into a combo box. 

String nation[] = {
    "Select Nationality",
    "Indian",
    "American",
    "British",
    "Australian",
    "Canadian"
};

for(String n : nation)
{
    UrfNat1.addItem(n);
}