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java.lang.NumberFormatException: empty String	at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:986)	at java.lang.Float.valueOf(Float.java:186)	at numericField.NumericField.getSelectedfloat(NumericField.java:64)	at undefined.NumericFieldDriver$ActionHandler.actionPerformed(NumericFieldDriver.java:72)	at java.awt.Button.processActionEvent(Button.java:381)	at java.awt.Button.processEvent(Button.java:350)	at java.awt.Component.dispatchEventImpl(Component.java:3526)	at java.awt.Component.dispatchEvent(Component.java:3367)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:191)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)