The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
GroupLayout layout manager combined with a builder tool to lay out your GUI. One such builder tool is the NetBeans IDE. Otherwise, if you want to code by hand and do not want to use GroupLayout, then GridBagLayout is recommended as the next most flexible and powerful layout manager. If you are interested in using JavaFX to create your GUI, see Working With Layouts in JavaFX.
Problem: How do I specify a component's exact size?
setSize or setBounds method on it. Otherwise, you need to provide size hints and then make sure you are using a layout manager that respects the size hints.getMinimumSize, getPreferredSize, and getMaximumSize methods. What is nice about this approach is that each getXxxxSize method can get the component's default size hints by invoking super.getXxxxSize(). Then it can adjust the size, if necessary, before returning it. This is particularly handy for text components, where you might want to fix the width, but have the height determined from the content. However, sometimes problems can be encountered with GridBagLayout and text fields, wherein if the size of the container is smaller than the preferred size, the minimum size gets used, which can cause text fields to shrink quite substantially.setMinimumSize, setPreferredSize, and setMaximumSize methods.revalidate method on it, to make sure that its containment hierarchy is laid out again. Then invoke the repaint method.FlowLayout and GridBagLayout managers use the component's preferred size (the latter depending on the constraints that you set), but BorderLayout and GridLayout usually do not. The BoxLayout manager generally uses a component's preferred size (although components can be larger), and is one of the few layout managers that respects the component's maximum size. Problem: My component does not appear after I have added it to the container.
revalidate and repaint after adding a component before it will show up in your container.Problem: My custom component is being sized too small.
getPreferredSize and getMinimumSize methods? If so, do they return the right values?If you do not see your problem in this list, see Solving Common Component Problems.