JTextField

[Maddimini]

Hallo ,

Ich habe ein JTextField und würde gerne, nachdem der User mit einem OK-Button bestätigt hat, das Textfeld auslesen, alsodas Eingegebene abspeichern und das Fenster unsichtbar schalten.
Leider bekomme ich immer einen Fehler.

JTextArea namenlos = new JTextArea("-Name-",1, 1);
[...]

JButton ready = new JButton("OK");
              contentPane.add(ready, BorderLayout.SOUTH);
              ready.addActionListener(new ActionListener() {
                               public void actionPerformed(ActionEvent e) { getReady(); }
                           });

 public void getReady()
        {
            fenster.setVisible(false);  
            GUI_2 gaming = new GUI_2();
            getReady2();
            }
            
public void getReady2()
            {
                          names = namenlos.getText();
                          System.out.println(names); 
            }
}

Schon einmal vielen Dank

 

[Final_Striker]

Was für einen Fehler?

 

[Maddimini]

der erscheint immer, wenn ich dann den OK Button gedrückt habe:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at entry.getReady2(entry.java:85)
at entry.getReady(entry.java:80)
at entry$1.actionPerformed(entry.java:63)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6263)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6028)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.lang.NullPointerException
at sun.jkernel.DownloadManager.getBootClassPathEntryForClass(DownloadManager.java:928)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:293)
at java.lang.ClassLoader.loadClass(ClassLoader.java:300)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at bluej.runtime.ExecServer$3.run(ExecServer.java:814)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at entry.getReady2(entry.java:85)
at entry.getReady(entry.java:80)
at entry$1.actionPerformed(entry.java:63)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6263)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6028)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

und der Name wird wird nicht ausgegeben ....

 

[EdelStoff]

ein bisschen wenig code um den Fehler zu finden.

Hast du die Variable fenster instanziert?

 

[Nicer]

public void getReady2()
{
names = namenlos.getText();
System.out.println(names);
}
}

[/code]
Schon einmal vielen Dank

Hier sagst du nicht welcher typ names ist .

mach es so :

public void getReady2()
            {
                          String names = new String();
                          names = namenlos.getText();
                          System.out.println(names); 
            }
}

und ich würde anstatt einer TextArea wirklich ein JTextField nehmen !

 

[Maddimini]

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;


public class entry
{
    private JFrame fenster;
    JRadioButton[] teams = new JRadioButton[2];
    JTextField namenlos;
    GUI_2 gaming;
    String names, he;
    
        public entry()
        {
            fensterErzeugen();
        }
    
        private void fensterErzeugen()
        {
            fenster = new JFrame("Herzlich Wilkommen");
            
            
            Container contentPane = fenster.getContentPane();
            contentPane.setLayout(new BorderLayout());
            JPanel help = new JPanel();
            
            
            help.setLayout( new GridLayout(0,2));
            contentPane.add(help, BorderLayout.CENTER);
            
             JLabel label_name = new JLabel("Name: ",  SwingConstants.CENTER);
             help.add(label_name);
             
             JTextField namenlos = new JTextField("-Name-");
             help.add(namenlos);
            
            JLabel label = new JLabel("Bitte wälen Sie:",  SwingConstants.CENTER);
            help.add(label);
            
            teams[0] = new JRadioButton("Spieler gegen Spieler");
            teams[1] = new JRadioButton("Spieler gegen Computer", true);
            JPanel pane = new JPanel();
            ButtonGroup group = new ButtonGroup();
            for ( int i = 0; i < teams.length; i++ ) {
                      group.add(teams[i]);
                      pane.add(teams[i]);
                }
             help.add(pane); 
             
             
             JLabel insane = new JLabel("Schwierigkeitsstufe: ",  SwingConstants.CENTER);
             help.add(insane);
             
             JComboBox insaneBox = new JComboBox();
             for ( int i = 1; i <11; i++)
             insaneBox.addItem("" + i );
             help.add(insaneBox);
             
             JButton ready = new JButton("OK");
             contentPane.add(ready, BorderLayout.SOUTH);
             ready.addActionListener(new ActionListener() {
                               public void actionPerformed(ActionEvent e) { getReady(); }
                           });
                           
              JLabel spielEinstellungen = new JLabel("Spieleinstellungen\n",   SwingConstants.CENTER);
                      spielEinstellungen.setForeground( Color.RED ); 
                              contentPane.setBackground(Color.black);
              contentPane.add(spielEinstellungen, BorderLayout.NORTH);
              
    
              fenster.pack();
              fenster.setVisible(true);
        }    
        
        public void getReady()
        {
            fenster.setVisible(false);  
            GUI_2 gaming = new GUI_2();
            getReady2();
         }
            
        public void getReady2()
        {
                          String names = new String();
                          names = namenlos.getText();
                          System.out.println(names);
         }
}

Das ist der Code, Danke schonmal
aber es klappt leider immer noch nicht...
Wenn mir einer helfen könnte wäre ich ihm sehr verbunden

Die Fehler kommen alle und noch mehr xD:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at entry.getReady2(entry.java:88)
at entry.getReady(entry.java:82)
at entry$1.actionPerformed(entry.java:64)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
[...]

 

[eRaaaa]

dein JTextField namenlos ist [c]null[/c]! Das kommt daher, dass du in Zeile 36 eine neue Variable namenlos anlegst, die deine Instanzvariable überdeckt... Lasse dort also das JTextField weg !
[java=36]
namenlos = new JTextField("-Name-");
[/code]

 

[Maddimini]

Danke, vielen Dank
du hast einen gut bei mir
ich bin dir wirklich sehr dankbar
:applaus: