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                > abstractAction主要是可以統一定制,不需要像actionListener要一個一個去注冊。 Jframe中一共3個地方用到了abstractAction:**jmenuitem**,**jtoobar**,**jbutton**。定義一次,三個地方都可以用 ## API 的解釋 > 此類提供JFC Action接口的默認實現。 此處定義了標準行為,如Action對象屬性的get和set方法(圖標,文本和啟用)。 開發人員只需要子類化這個抽象類并定義actionPerformed方法。
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