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POStrange Java cast exception. Why can't I cast Long to a Float?
 

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  1. POStrange Java cast exception. Why can't I cast Long to a Float?
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    <p>Why can't I cast Long to a Float?</p> <p>I get this error message:</p> <blockquote> <p>java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Float</p> </blockquote> <p>Why is this a problem? The numbers that I'm trying to cast are decimals in the domain [-10.0, 10.0]. They start out as Object instances returned using <code>JFormattedTextField.getValue()</code>. But they must be converted to floats.</p> <h2>Stack trace:</h2> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Float at submodeler.animation.Timeline.setKeyedAttribute(Timeline.java:59) at submodeler.ui.attributes.TransformationAttributePanel.actionPerformed(TransformationAttributePanel.java:247) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351) 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:6348) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6113) at java.awt.Container.processEvent(Container.java:2085) at java.awt.Component.dispatchEventImpl(Component.java:4714) at java.awt.Container.dispatchEventImpl(Container.java:2143) at java.awt.Component.dispatchEvent(Component.java:4544) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4618) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212) at java.awt.Container.dispatchEventImpl(Container.java:2129) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4544) at java.awt.EventQueue.dispatchEvent(EventQueue.java:635) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) </code></pre>
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    1. USPeter Mortensen
    1. USCJJ
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    1. COeventually provide the sourcecode around Timeline.java:59 to find a solution.
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      1. USAndreas Petersson
    2. COThis is what's happening in Timeline: public void setKeyedAttribute(int position, String property, Object value){ lastIndex = addKeyFrameAt(position); keyframes.get(lastIndex).setAttribute(property, value); } However, now I have changed it to require a float type for the value input parameter. And that (combined with kdgregory's response) has solved the problem. thanks!
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