小编CJJ*_*CJJ的帖子

为什么我不能将Long投入Float？

我收到此错误消息:

java.lang.ClassCastException:java.lang.Long无法强制转换为java.lang.Float

为什么这是个问题？我想要施放的数字是域[-10.0,10.0]中的小数.它们从使用返回的Object实例开始JFormattedTextField.getValue().但它们必须转换成浮点数.

堆栈跟踪:

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)

我有一个双打的二进制文件,我需要使用C++加载.但是,我的问题是它是用big-endian格式编写的,但是fstream >> operator会因为我的机器是little-endian而读错了.解决整数似乎是一个简单的问题,但对于双精度和浮点数,我找到的解决方案将无效.我怎么能(或应该)解决这个问题？

我把它读作整数字节交换的参考:
如何在C++中的big-endian和little-endian值之间进行转换？

编辑:虽然这些答案很有启发性,但我发现我的问题在于文件本身而不是二进制数据的格式.我相信我的字节交换确实有效,我只是得到了令人困惑的结果.谢谢你的帮助!