JAVA DI BASICS

    //Make other Screens visible after pressing a button
    Agregar agregar = new Agregar();
    agregar.setVisible(true);

    //Modify elements
    jTextFieldDni.setText(dni);
    jTextFieldDni.setFocusable(false);
    jTextFieldSalarioAnual.requestFocus();
    jComboBoxConversor.addActionListener(new Listener());
    jTextFieldDolares.setEditable(false);

    jTextFieldEuros.getText()

    //MODAL
    Modal mo = new Modal();
    mo.setVisible(true);
    frameModal();

    //NO MODAL
    NoModal mo = new NoModal();
    mo.setVisible(true);

    //JTABLE
    private void inicializarTabla(){
        DefaultTableModel dtm = new DefaultTableModel();
        dtm.setColumnIdentifiers(new String[]{"Nombre","Tipo","Cantidad","Tienda"});
        jTableStock.setModel(dtm);
    }

    //JSPINNER
    private void inicializarJSpinner(ArrayList data){
        SpinnerModel model = new SpinnerListModel(data);
        jSpinnerAlumnos.setModel(model);
        jSpinnerAlumnos.setValue(primero());
    }