Netbeans - JPanel w osobnym pliku.

0

Posiadam program, składający się z dwóch plików:
Program.java oraz Wyswietlenie.java.
Pierwszy odpowiada za wyświetlenie okna aplikacji itp, natomiast w drugim pliku znajduje się klasa JPanel, która powinna wyświetlać odpowiednie elementy. Jak wstawić właśnie ten JPanel z pliku Wyswietlanie.java do klasy Program (która jest główną klasą programu). Oto kody źródłowe obydwóch plików:
Program.java:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package program;

/**
 *
 * @author Michal
 */
public class Program extends javax.swing.JFrame {

    /**
     * Creates new form Program
     */
    public Program() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Program.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Program.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Program.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Program.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new Program().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    // End of variables declaration
}

Wyswietlanie.java:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package program;

/**
 *
 * @author Michal
 */
public class Wyswietlanie extends javax.swing.JPanel {

    /**
     * Creates new form Wyswietlanie
     */
    public Wyswietlanie() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();

        jLabel1.setText("Tekst");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addContainerGap(81, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addContainerGap(45, Short.MAX_VALUE))
        );
    }// </editor-fold>
    // Variables declaration - do not modify
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
}

0

Ja bym to zrobił tak:
Najpierw w klasie głównej wyświetlającej okno programu trzeba zdefiniować panel. Oczywiście trzeba go dodać do okna.

getContentPane().remove(panel);//usuwanie starego panelu
panel = new PanelZdj();//nowy panel wcześniej zadeklarowany PanelZdj to nazwa klasy dziedziczącej po JPanel
getContentPane().add(panel, BorderLayout.CENTER);//dodajemy panel do okna
setVisible(true);//uwidaczniamy 

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