java - 如何使用 JFrame.pack()？

Question

我如何使用pack()以及它的作用是什么？

例如:

//1. Create the frame.
JFrame frame = new JFrame("FrameDemo");

//2. Optional: What happens when the frame closes?
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//3. Create components and put them in the frame.
//...create emptyLabel...
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);

//4. Size the frame.  (How does pack() set the frame size???)
frame.pack();

//5. Show it.
frame.setVisible(true);

Answer 1

该方法的行为在文档(javadoc)中指定。

这是 Window.pack 的文档.

Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. The resulting width and height of the window are automatically enlarged if either of dimensions is less than the minimum size as specified by the previous call to the setMinimumSize method.