Hi,
ich habe mit Eclipse eine kleine Anwendung erstellt, ganz einfach. 2 Textfelder, in denen man Zahlen eingibt. Auf Button.Klick wird etwas berechnet und in dem 3. Textfeld angezeigt.
Leider bekomme ich eine Fehlermeldung, wenn ich versuche die Strings der Textfelder in Double-Werte zu konvertieren. Vielleicht könnt ihr mir ja helfen.
Danke im Voraus.
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Java Quellcode
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private void berechne(){
double taktzahl = Double.parseDouble(jLabel_taktzahl.getText()); // Zeile 129
double taktzyklus = Double.parseDouble(jLabel_taktzyklus.getText());
jTextField_result.setText(Double.toString(taktzahl/taktzyklus));
}
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Fehlermeldung:
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Source code
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Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "Taktzahl"
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Double.parseDouble(Unknown Source)
at frame.berechne(frame.java:129)
at frame.access$0(frame.java:128)
at frame$1.actionPerformed(frame.java:108)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.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)
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