Now go to the top of the frame, place the mouse cursor over the TestActivity icon, and a menu bar appears.

现在转到框架的顶部，将鼠标放到TestActivity图标上，会出现一个菜单栏。

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It is a top-level window with a border, title, and optional menu bar. Listing 3 shows the declaration of the calculator's frame.

它是一个顶级窗口，具有边框、标题和可选菜单栏。

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CBRS_TOP Control bar is at top of frame window.

控制条在框架窗口顶部。

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