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enter code here嗨我是新的Java開發人員我想將JComboBox放入公共類中以獲取選定的項目，但Java無法識別它，例如我想要執行此操作。公共類中的JComboBox
myComboBox.getSelectedItem().toString()
當我嘗試把JTextField它工作正常。
對不起，我表達我不會講英語非常好
那是我的代碼
package guarderia;
import java.awt.BorderLayout;
public class enfermedades extends JFrame {
private JPanel contentPane;
private JTextField txtid;
private JTextField textField_1;
private JTextField txtnom;
private static JTable table;
//VARIABLES PARA CONEXION A MYSQL
static Connection con;
static CallableStatement ps;
static ResultSet rs;
static DefaultTableModel tm;
static Statement sql;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
enfermedades frame = new enfermedades();
frame.setVisible(true);
llenar();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public enfermedades() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 1211, 663);
contentPane = new JPanel();
contentPane.setBackground(new Color(255, 255, 255));
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setLayout(null);
panel.setBackground(new Color(0, 0, 0));
panel.setBounds(0, 0, 1624, 53);
contentPane.add(panel);
JLabel lblEnfermedades = new JLabel("ENFERMEDADES");
lblEnfermedades.setForeground(Color.WHITE);
lblEnfermedades.setFont(new Font("Dialog", Font.BOLD, 19));
lblEnfermedades.setBounds(12, 12, 231, 41);
panel.add(lblEnfermedades);
JPanel panel_1 = new JPanel();
panel_1.setLayout(null);
panel_1.setBounds(10, 102, 426, 510);
contentPane.add(panel_1);
JLabel lblIdNio = new JLabel("ID Niño");
lblIdNio.setBounds(12, 30, 70, 15);
panel_1.add(lblIdNio);
txtid = new JTextField();
txtid.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
int c = e.getKeyChar();
if (c < '0' || c > '9') e.consume();
}
@Override
public void keyReleased(KeyEvent e) {
con= (Connection) conexion.conectar();
try {
if (txtid.getText().equals(""))
{
txtnom.setText("");
}
ps = (CallableStatement) con.prepareCall("{call select_nin (?) }");
ps.setLong(1, Integer.parseInt(txtid.getText()));
ResultSet res = ps.executeQuery();
if (res.next())
{
String tipo = res.getString("Nombre");
txtnom.setText(tipo);
llenar();
}
else
{
txtnom.setText(null);
}
} catch (SQLException e1) {
JOptionPane.showMessageDialog(null, e1);
}
}
});
txtid.setColumns(10);
txtid.setBounds(120, 28, 146, 19);
panel_1.add(txtid);
JLabel cbi = new JLabel("Enfermedad");
cbi.setBounds(12, 95, 194, 15);
panel_1.add(cbi);
JLabel lblTratamiento = new JLabel("Tratamiento");
lblTratamiento.setBounds(12, 130, 194, 15);
panel_1.add(lblTratamiento);
JButton btnNueva = new JButton("Nueva");
btnNueva.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
btnNueva.setBounds(282, 90, 88, 25);
panel_1.add(btnNueva);
JTextPane textPane = new JTextPane();
textPane.setBounds(12, 157, 402, 118);
panel_1.add(textPane);
JLabel lblFechaDeteccion = new JLabel("Fecha Deteccion");
lblFechaDeteccion.setBounds(12, 299, 194, 15);
panel_1.add(lblFechaDeteccion);
textField_1 = new JTextField();
textField_1.setColumns(10);
textField_1.setBounds(135, 297, 95, 19);
panel_1.add(textField_1);
JLabel lblNombre = new JLabel("Nombre");
lblNombre.setBounds(12, 61, 70, 15);
panel_1.add(lblNombre);
txtnom = new JTextField();
txtnom.setEditable(false);
txtnom.setColumns(10);
txtnom.setBounds(120, 56, 294, 19);
panel_1.add(txtnom);
JLabel lblMedidadRecomendadas = new JLabel("Medidas recomendadas");
lblMedidadRecomendadas.setBounds(12, 330, 194, 15);
panel_1.add(lblMedidadRecomendadas);
JTextPane textPane_1 = new JTextPane();
textPane_1.setBounds(12, 355, 402, 93);
panel_1.add(textPane_1);
JButton btnGuardar = new JButton("Guardar");
btnGuardar.setBounds(297, 470, 117, 25);
panel_1.add(btnGuardar);
JComboBox cbx = new JComboBox();
cbx.setBounds(120, 90, 146, 24);
panel_1.add(cbx);
JPanel panel_2 = new JPanel();
panel_2.setLayout(null);
panel_2.setBackground(new Color(220, 20, 60));
panel_2.setBounds(10, 65, 426, 32);
contentPane.add(panel_2);
JLabel lblRegistrarEnfermedad = new JLabel("Registrar enfermedad");
lblRegistrarEnfermedad.setForeground(Color.WHITE);
lblRegistrarEnfermedad.setFont(new Font("Dialog", Font.BOLD, 19));
lblRegistrarEnfermedad.setBounds(12, 5, 401, 23);
panel_2.add(lblRegistrarEnfermedad);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(448, 102, 751, 510);
contentPane.add(scrollPane);
table = new JTable();
scrollPane.setViewportView(table);
JPanel panel_3 = new JPanel();
panel_3.setLayout(null);
panel_3.setBackground(new Color(128, 0, 128));
panel_3.setBounds(448, 65, 751, 32);
contentPane.add(panel_3);
JLabel lblEnfermedades_1 = new JLabel("Enfermedades");
lblEnfermedades_1.setForeground(Color.WHITE);
lblEnfermedades_1.setFont(new Font("Dialog", Font.BOLD, 19));
lblEnfermedades_1.setBounds(12, 5, 401, 23);
panel_3.add(lblEnfermedades_1);
}
public static void llenar()
{
try
{
con = (Connection) conexion.conectar();
String[]titulos={"ID", "ENFERMEDAD", "DESCRIPCION", "RIESGO CONTAGIO", "TIPO"};
String cmd = "select * from enfermedades";
tm = new DefaultTableModel(null,titulos);
sql = (Statement) con.createStatement();
ResultSet rs = sql.executeQuery(cmd);
String[]fila = new String[5];
while(rs.next())
{
fila[0]= rs.getString("id");
fila[1]= rs.getString("enfermedad");
fila[2]= rs.getString("descripcion");
fila[3]= rs.getString("riesgo");
fila[4]= rs.getString("tipo");
tm.addRow(fila);
}
table.setModel(tm);
TableColumnModel columnModel = table.getColumnModel();
columnModel.getColumn(0).setPreferredWidth(3);
columnModel.getColumn(1).setPreferredWidth(50);
columnModel.getColumn(2).setPreferredWidth(290);
}
catch(Exception d)
{
JOptionPane.showMessageDialog(null, d + " No se pudo conectar.");
}
}
public void ns()
{
cbx. //this is where not recognize the jcombobox
}
}
請在代碼中顯示錯誤消息和上下文代碼 –
幾個問題：您通常不希望公開您的字段，因爲這會增加錯誤的風險。更好的是讓它保密，然後讓外部課程通過受控的公共方法來選擇。下一個大問題是我們對程序的結構知之甚少，或者你想如何使用這個組件。請在您的問題中添加更多信息和相關代碼。 –
抱歉，我現在投入 –