So, I'm trying to access the (only) label "lblNewLabel" in class "TesteRotulo" from class "Controle".
public class TesteRotulo {
private JFrame frame;
private JLabel lblNewLabel;
// getter for the label to be accessed by class Controle
public JLabel getLblNewLabel() {
return lblNewLabel;
}
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TesteRotulo window = new TesteRotulo();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public TesteRotulo() {
initialize();
// instantiate new object Controle having this instance of Testerotulo as parameter
Controle c = new Controle(TesteRotulo.this);
c.setRotulo();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel lblNewLabel = new JLabel();
frame.getContentPane().add(lblNewLabel, BorderLayout.CENTER);
frame.setVisible(true);
}
}
The class Controle that should access the label in TesteRotulo
public class Controle {
private TesteRotulo jM;
private JFrame janela;
private JLabel rotulo;
public Controle(TesteRotulo jM) {
this.jM = jM;
}
public void setRotulo() {
this.rotulo = jM.getLblNewLabel();
rotulo.setText("teste");
}
}
So I think having the reference for the (only) instance of TesteRotulo I should be able to access the label. But to no avail. Always get a null pointer exception. What is wrong? Thanks in advance...
