Afficher un tableau de JTextField

Version imprimable

Bonjour j'aimerai ajouter à mon FlowLayout un tableau de JTextField qu ise génère selon un nombre tapé au préalable par l'utilisateur.
Pour ce faire, j'ai inclus une boucle :

Code:

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	public static void generateFields(int number, JPanel panel) {
		JTextField[] txttab = new JTextField[number];
		for(int i = 0 ; i < number ; i++) {
			panel.add(txttab[i]);
		}
	}

Problème : j'obtiens une NullPointerException qui me bloque :

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.awt.Container.addImpl(Unknown Source)
	at java.awt.Container.add(Unknown Source)
	at com.nop.newfile.views.ChoosePostesWindow.generateFields(ChoosePostesWindow.java:74)
	at com.nop.newfile.views.ChoosePostesWindow.actionPerformed(ChoosePostesWindow.java:84)
	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$200(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$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.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$1.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)

J'aimerai donc pouvoir utiliser mon tableau créé grâce au nombre entré par l'utilisateur.
Auriez-vous une solution ?

Salut,

tu crées un tableau mais tu ne le remplis pas :

Code:

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public static void generateFields(int number, JPanel panel) {
		JTextField[] txttab = new JTextField[number];
		for(int i = 0 ; i < number ; i++) {
                        // ICI IL MANQUE LA CREATION
                        txttab[i]=new JTextField(....
                        // ICI IL MANQUE LA CREATION 
			panel.add(txttab[i]);
		}
	}

Après, pourquoi créer un tableau ?

Je pensais que le fait que je fasse "new JTextField [number]" suffisait. C'est une erreur de ma part.
Quant à l'erreur, elle ne disparaît pas :

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.awt.Container.addImpl(Unknown Source)
	at java.awt.Container.add(Unknown Source)
	at com.legimetrie.newfile.views.ChoosePostesWindow.generateFields(ChoosePostesWindow.java:81)
	at com.legimetrie.newfile.views.ChoosePostesWindow.actionPerformed(ChoosePostesWindow.java:92)
	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$200(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$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.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$1.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)

Aurais-tu une idée s'il te plaît ?

Citation:

Envoyé par Orionss

Aurais-tu une idée s'il te plaît ?

Comment créés tu ton panel ? Quel layout ?

Sinon voilà un petit exemple qui tourne sans problème chez moi :

Code:

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import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class Test {
 
	public static void main(String[] args) {
 
		JFrame f = new JFrame();
 
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(300, 170);
		f.setLocationRelativeTo(null);
 
		JPanel panel = new JPanel();
		f.getContentPane().add(panel);
 
		generateFields(10, panel); 
 
		f.setVisible(true);
 
 
	}
	public static JTextField[] generateFields(int number, JPanel panel) {
		JTextField[] txttab = new JTextField[number];
		for(int i = 0 ; i < number ; i++) {
                        txttab[i]=new JTextField(10);
			panel.add(txttab[i]);
		}
                return txttab;
	}
 
}