Witam mam problem nie wiem jak usunąć obrazek w javie obrazek dodaje przez Jlabel
JLabel errorimg = new JLabel(new ImageIcon("image/error.png"));
errorimg.setBounds(50,190,200,200);
add(errorimg);
chce zrobić powrót do panelu logowania lecz nie moge usunąć tego obrazka metoda remove(errorimg); nie działa
Proszę o pomoc
Wrzucaj kod do znaczników.
errorimg.setVisible(false);
Kandif napisał(a):
Wrzucaj kod do znaczników.
errorimg.setVisible(false);
coś nie działa wywala błąd
Podaj błąd, w ogóle podaj więcej kodu.
Ewentualnie usuń starą metodą, ale dodaj :
remove(errorimg);
revalidate();
repaint();
Kandif napisał(a):
Podaj błąd, w ogóle podaj więcej kodu.
Ewentualnie usuń starą metodą, ale dodaj :
remove(errorimg);
revalidate();
repaint();
Błąd jest następujący
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at modul_1.program.actionPerformed(program.java:206)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
public void error(){
setSize(760,500);
setTitle("nazwa");
setLayout(null);
images();
remove(login);
remove(plogin);
remove(phaslo);
remove(pass);
remove(zaloguj);
remove(user);
remove(title);
getContentPane().setBackground(Color.WHITE);
errortitle = new JLabel("Nazwa » Error");
errortitle.setBounds(230, 90, 500,60);
errortitle.setForeground(new Color(0,200,200));
errortitle.setFont(new Font("SansSerif", Font.BOLD, 40));
add(errortitle);
error = new JLabel("Error !");
error.setBounds(380,160,200,200);
error.setFont(new Font("SanSerif", Font.BOLD,20));
error.setForeground(Color.RED);
add(error);
errorinfo = new JLabel("Niepoprawny login lub hasło !");
errorinfo.setBounds(290,220,400,200);
errorinfo.setFont(new Font("SanSerif", Font.BOLD,20));
errorinfo.setForeground(Color.RED);
add(errorinfo);
back = new JButton("Powrot");
back.setBounds(240,380,260,50);
back.setBorder(BorderFactory.createMatteBorder(2,2,2,2,Color.darkGray));
back.setBackground(Color.DARK_GRAY);
back.setFont(new Font("SansSerif", Font.ITALIC,20));
back.setForeground(new Color(0,200,200));
back.addActionListener(this);
add(back);
JLabel errorimg = new JLabel(new ImageIcon("image/error.png"));
errorimg.setBounds(50,190,200,200);
add(errorimg);
}
Etykiete "errorimg" tworzysz lokalnie w metodzie error, dlatego nie masz do niej dostępu z innego miejsca, więc program wyrzuca wyjątek NullPointerException.
Kandif napisał(a):
Etykiete "errorimg" tworzysz lokalnie w metodzie error, dlatego nie masz do niej dostępu z innego miejsca, więc program wyrzuca wyjątek NullPointerException.
hmm czyli powinienem zrobić takie coś
final JLabel errorimg = new JLabel(new ImageIcon("image/error.png"));
Dziękuje za pomoc działa :D