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java awt中的顶级窗口是什么？

[英]What is a top-level window in java awt?

原文 2017-03-06 12:50:12 4 4 java/ window/ awt/ containers/ frame

I found this line on the java docs tutorial site- "A Frame is a top-level window with a title and a border". 我在java docs教程网站上找到了这一行 - “一个框架是一个带有标题和边框的顶级窗口”。 Here, what is the meaning of "top-level window"? 这里，“顶级窗口”的含义是什么？

4 个解决方案

In GUI toolkits such as AWT, a top-level window is a window which is usually known to the OS (heavy-weight components). 在诸如AWT的GUI工具包中，顶级窗口是OS通常已知的窗口（重量级组件）。

Side note: AWT (and even Swing) is a pretty old technology. 旁注：AWT（甚至是Swing）是一项非常古老的技术。 I recommend to use JavaFX where possible. 我建议尽可能使用JavaFX。

A 'top-level window' or 'top level container' is something that can be shown on screen without having to add it to another component. “顶级窗口”或“顶级容器”可以在屏幕上显示，而无需将其添加到另一个组件。 We would start a GUI with a top level container, and then add panels and components to that TLC. 我们将使用顶级容器启动GUI，然后将面板和组件添加到该TLC。 EG of top level containers.. 顶级容器的EG ..

AWT - Frame , Window , Dialog .. AWT - Frame ， Window ， Dialog ..
Swing - JFrame , JWindow , JDialog , JOptionPane .. Swing - JFrame ， JWindow ， JDialog ， JOptionPane ..
Java-FX - Stage (I have not used Java-FX much, so am unfamiliar with the other variants of TLCs, but see the Java-FX API docs for other examples). Java-FX - Stage （我没有使用过很多Java-FX，所以我不熟悉TLC的其他变种，但是请参阅Java-FX API文档以获取其他示例）。

See also this answer for many good reasons to abandon AWT components in favor of Swing. 另请参阅此答案有很多理由放弃AWT组件，转而使用Swing。 As to abandoning Swing for Java-FX, I'll be unwilling to do so until Java-FX is promoted to the Java API's Java docs, and makes it into the official Java Tutorial. 至于放弃Swing for Java-FX，我将不愿意这样做，直到Java-FX被提升为Java API的Java文档，并使其成为官方Java教程。 Sun, then Oracle, has a bad habit of hyping many technologies only to later quietly drop support & development for them. Sun，然后是甲骨文，有一种不好的习惯，即只能在以后悄悄地放弃对它们的支持和开发。

a window without a parent. 没有父母的窗口。

a window can have child windows alright and they have a parent then 一个窗口可以让子窗口正常，然后他们有一个父窗口

Observe difference among these classes. 观察这些类别之间的差异。

Frame is top level window because it has border and title. 框架是顶级窗口，因为它有边框和标题。 An instance of frame can have a menubar. 框架的实例可以具有菜单栏。 Without those it is mere is an instance of java.awt.Window class. 没有它，它只是java.awt.Window类的一个实例。

Window class: It has neither border not title. Window类：它既没有边框也没有标题。 Window class is not attached to nor embedded within another container. Window类未附加到另一个容器中，也未嵌入其中。

Dialog: It has border and title. 对话：它有边框和标题。 An instance of the Dialog class cannot exist without an associated instance of the Frame class. 没有Frame类的关联实例，Dialog类的实例不能存在。

Panel: just a generic container to hold components. Panel：只是一个容纳组件的通用容器。 Its instance provides a container to which to add components. 它的实例提供了一个可以添加组件的容器。

Note: Revert me back if further clarification is required. 注意：如果需要进一步说明，请将其还原。