erreur après avoir appuyé sur le bouton Annuler 'C' dans la calculatrice (Eclipse IDE et balançoires)

Question

c'est mon code pour annuler le bouton quand je l'appuie avant d'appuyer sur le bouton '=' ça marche bien mais après avoir appuyé sur '=' au résultat final est affiché et si le bouton « C » est pressé il est montrant java.lang.NumberFormatException morceau de code ici et « convertir » & « s'is une chaîne

if(e.getSource() == buttonOp){ 
       convert = Integer.parseInt(txt.getText()); 
       System.out.println("parsing done!"); 
       String choice = e.getActionCommand(); 
       if(choice.equals("x^2")){ 
        txt.setText(""); 
        total = convert * convert; 
        System.out.println("total is"+total); 
        s += txt.getText(); 
       } 
       else if(choice.equals("x^3")){ 
        txt.setText(""); 
        total = convert * convert * convert; 
        s += txt.getText(); 
       } 
       else if (choice.equals("=")){ 
       //txt.setText(choice); 
       // number = true; 
        number = false; 
        txt.setText(""); 
        System.out.println("pressed '='"); 
        if(txt.getText().length() > 0){ 
         StringBuilder sb = new StringBuilder(txt.getText()); 
         sb.delete(0, txt.getText().length()); 
         s = sb.toString(); 
        } 
       s = Double.toString(total); 
       s += txt.getText(); 
      } 
       /*else if (choice.equals("+")){ 
        total = convert; 

       }*/ 
       else if(choice.equals("C")){ 
        System.out.println("pressing C"); 
        if(txt.getText().length()>0){ 
         StringBuilder str = new StringBuilder(txt.getText()); 
         str.deleteCharAt(txt.getText().length()-1); 
         s = str.toString(); 
        } 
        txt.setText(s); 
        } 
       } 
      else{ 
       txt.setText(null); 
      } 
      txt.setText(s); 
      } 
     }); 

ici est la sortie que je reçois en appuyant sur » Ç 'après' = '

parsing done! 
    total is2601.0 
    parsing done! 
    pressed '=' 
    Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException:  For input string: "2601.0" 
at java.lang.NumberFormatException.forInputString(Unknown Source) 
at java.lang.Integer.parseInt(Unknown Source) 
at java.lang.Integer.parseInt(Unknown Source) 
at cal.Calculator$2.actionPerformed(Calculator.java:95) 
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
at javax.swing.AbstractButton$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) 

Answer 1

de l'exception

.... parseInt (Source inconnue) ...

... Pour chaîne d'entrée: "2601,0" ...

donc vous appellent parseInt() pour un non int formatée ("2601.0").

Je pense que votre problème est ici

if(e.getSource() == buttonOp){ 
     convert = Integer.parseInt(txt.getText()); // <<<< 

donc soit lieu cela en place plus appropriée (à l'intérieur du if-else) en tant que valeurs non-int ou utiliser Dobule.parseDouble() sont très possible pour une application de calculatrice.