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void	caretPositionChanged(InputMethodEvent event)           This method is called when the cursor position within the text is changed.
void	inputMethodTextChanged(InputMethodEvent event)           This method is called when the text is changed.

inputMethodTextChanged 事件在文字改變后觸發


The text field fires three events: a key-pressed event, a key-typed event, and a key-released event.
Note :
the key-typed event doesn't have key code information. 含有key charactere信息
key-pressed and key-released events don't have key character information. 含有key code信息

用來檢驗text changed可以用key-released events. 因為它能夠通過getText（）得到textfield中改變后的text.  而 key-pressed event, key-typed event 得到的是改變前的文字