Jtable Füllung sequentiell in Java

Question

mein Code erlauben, Listeninhalt in jtable mit der Methode "save1", die in einem jbutton verwendet wird, zu setzen. Das Problem ist, dass es nach dem Ausführen einige Ausnahmen gibt. Diese Zeile der Anweisungen "DefaultTableModel tableModel = fen.getmodel();" in der Methode save1 ist der Grund der Ausnahme.

Hier ist die Codes von "SAVE1", die Taste und die Ausnahmen:

public void save1(String pathToExplore) throws IOException, JDOMException{ 
ArrayList<String>liste= getArrowTexts(); 

System.out.println(liste); 
Lister_path diskFileExplorer = new Lister_path(pathToExplore,true); 
ArrayList<String> result= diskFileExplorer.Lister_path(); 
Lister_Rep listerep=new Lister_Rep(pathToExplore,true); 
    ArrayList<String> result1= listerep.Lister_Rep(); 
      int l=0,row=0,i=0; 
    //Fenetre1 fen=new Fenetre1(); 
    DefaultTableModel tableModel = fen.getmodel(); 
    while(i< result.size()&& l<result1.size()){ 
    String nompath=result.get(i); 
    ReadExeLS reedexel=new ReadExeLS(); 
     ArrayList<String> lisn=reedexel.ReadEx(nompath); 
     int j=0,k=0;int S=0; 
     while(j<liste.size()&&k<lisn.size()){ 
      if((liste.get(j)).equals(lisn.get(k))){ 
       System.out.println(liste.get(j)); 
       j++;k++;S++; 

       System.out.println(S); 
       if(j==liste.size()){ 
        k=lisn.size();} 
       else{ k++;} 

      }else{k++; 
      System.out.println(S);} 

     } 
    if(S==0){ 



     System.out.println(result1.get(l)); 
     tableModel.addRow(new String[] {"Not case","Success","Failed"}); 
     tableModel.setValueAt(result1.get(l), row, 2); 
      l++;row++;i++; 




    }else if(S==liste.size()){ 
     System.out.println(result1.get(l)); 
     tableModel.addRow(new String[] {"Not case","Success","Failed"}); 
    tableModel.setValueAt(result1.get(l), row, 1); 
    l++;row++;i++;} 
    else{ 
    tableModel.addRow(new String[] {"Not case","Success","Failed"}); 
    tableModel.setValueAt(result1.get(l), row, 0); 
    System.out.println(result1.get(l)); 
    l++;row++;i++; 

    } 




    } 

} 





public void actionPerformed(ActionEvent e) { 



    String path="C:\\Users\\W.S.I\\Desktop\\Bureau\\76\\20161129\\IMSI-627010102119665"; 
     try { 
      save1(path); 
     } catch (IOException ex) { 
      Logger.getLogger(Exemple.class.getName()).log(Level.SEVERE, null, ex); 
     } catch (JDOMException ex) { 
      Logger.getLogger(Exemple.class.getName()).log(Level.SEVERE, null, ex); 
     } 
    } 


    }); 








    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
at Exemple.Save1(Exemple.java:475) 
at Exemple$1.actionPerformed(Exemple.java:94) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) 
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) 
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) 
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) 
at java.awt.Component.processMouseEvent(Component.java:6533) 
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) 
at java.awt.Component.processEvent(Component.java:6298) 
at java.awt.Container.processEvent(Container.java:2236) 
at java.awt.Component.dispatchEventImpl(Component.java:4889) 
at java.awt.Container.dispatchEventImpl(Container.java:2294) 
at java.awt.Component.dispatchEvent(Component.java:4711) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) 
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) 
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) 
at java.awt.Container.dispatchEventImpl(Container.java:2280) 
at java.awt.Window.dispatchEventImpl(Window.java:2746) 
at java.awt.Component.dispatchEvent(Component.java:4711) 
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) 
at java.awt.EventQueue.access$500(EventQueue.java:97) 
at java.awt.EventQueue$3.run(EventQueue.java:709) 
at java.awt.EventQueue$3.run(EventQueue.java:703) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) 
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) 
at java.awt.EventQueue$4.run(EventQueue.java:731) 
at java.awt.EventQueue$4.run(EventQueue.java:729) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) 
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) 
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) 
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 

Answer 1

Sie eine Nullpointer bekommen. Dies bedeutet, dass auf der Linie

DefaultTableModel tableModel = fen.getmodel(); 

Sie eine Methode auf etwas fordern, die null ist.

Hinweis: Die obige Zeile ist auskommentiert. Was genau ist der aktuelle Wert von "fen"?