Bonjour à tous
J'ai encore un probleme avec les fenetres mais cela concerne plus maintenant les evénements
voici mon code Code : Java
mais il y a une erreur quand je clique sur l'un des boutons !
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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68 import javax.swing.*; import java.awt.event.*; import java.awt.*; //////////////////////////////// class MaFenetre extends JFrame implements ActionListener { public MaFenetre() { setTitle("Fenetre"); setBounds(50,50,300,200); Container contenu = getContentPane(); // panneau JPanel pan = new Panneau(); pan.setBackground(Color.yellow); getContentPane().add(pan); // rectangle JButton rectangle = new JButton("Rectangle"); contenu.add(rectangle,"North"); rectangle.addActionListener(this); // ovale JButton ovale = new JButton("Ovale"); contenu.add(ovale,"South"); ovale.addActionListener(this); } public void actionPerformed (ActionEvent ev) { if(ev.getSource() == rectangle) pan.setRectangle(); if(ev.getSource() == ovale) pan.setOvale(); pan.repaint(); } private Panneau pan; private JButton rectangle,ovale; } ///////////////////////////////// class Panneau extends JPanel { public void paintComponent(Graphics g) { super.paintComponent(g); if(ovale) { g.drawOval(80,20,120,60); } if(rectangle) { g.drawRect(80,20,120,60); } } public void setRectangle() { ovale = false; rectangle = true; } public void setOvale() { ovale = true; rectangle = false; } private boolean rectangle = false; private boolean ovale = false; } ///////////////////////////////// public class Fenetre { public static void main(String[] args) { JFrame Fen = new MaFenetre(); Fen.setVisible(true); } }
Merci encore !
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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38 Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at MaFenetre.actionPerformed(Fenetre.java:29) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:18 49) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav a:2169) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel .java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258 ) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL istener.java:234) at java.awt.Component.processMouseEvent(Component.java:5488) at javax.swing.JComponent.processMouseEvent(JComponent.java:3126) at java.awt.Component.processEvent(Component.java:5253) at java.awt.Container.processEvent(Container.java:1966) at java.awt.Component.dispatchEventImpl(Component.java:3955) at java.awt.Container.dispatchEventImpl(Container.java:2024) at java.awt.Component.dispatchEvent(Component.java:3803) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212 ) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822) at java.awt.Container.dispatchEventImpl(Container.java:2010) at java.awt.Window.dispatchEventImpl(Window.java:1774) at java.awt.Component.dispatchEvent(Component.java:3803) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
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