RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating system designed for embedded systems.
The acronym RTEMS initially stood for Real-Time Executive for Missile Systems, then became Real-Time Executive for Military Systems before changing to its current meaning. RTEMS development began in the late 1980s with early versions of RTEMS available via ftp as early as 1993. OAR Corporation is currently managing the RTEMS project in cooperation with a Steering Committee which includes user representatives.
在一個窗體上的上面放置兩個按鈕“Open”和“Save”,在一個JFrame的窗體上放置一個文本區,點擊“Open”按鈕,彈出打開對話框，選擇一個文件打開后，在文本區中顯示 “Opening:新建文本文檔.txt.”，若選擇了“取消”，則在文本區中顯示“Open command cancdlled by user.”,點擊“Save”按鈕,彈出保存對話框，選擇“保存”后，在文本區中顯示 “Saving:新建文本文檔.txt”，若選擇了“取消”，則在文本區中顯示Save command cancdlled by user
