Introduction to Java graphical user interface design (Swing)

Preface

Swing is a development toolkit for developing user interfaces for Java applications. It is based on the Abstract Window Toolkit (AWT) to enable cross-platform applications to use any pluggable appearance style. Swing developers can take advantage of Swing's rich, flexible features and modular components to create elegant user interfaces with only a small amount of code.

Swing is a GUI toolkit designed for Java.

Swing is part of the JAVA basic classes.

Swing includes graphical user interface (GUI) components such as text boxes, buttons, split panes, and tables.

Swing provides many better screen display elements than AWT. They are written in pure Java, so they can run cross-platform like Java itself, unlike AWT. They are part of JFC. They support replaceable panels and themes (default specific themes for various operating systems), but do not actually use the devices provided by the native platform, but only superficially imitate them. This means you can use any panel supported by JAVA on any platform. The disadvantage of lightweight components is that they execute slowly, but the advantage is that they can adopt uniform behavior on all platforms.

Hello World program

HelloWorldSwing.java file code is as follows:

Execute the following command to output the result:

A user login box instance

SwingLoginExample.java file code is as follows:

Execute the following command to output the result:

Concept analysis:

JFrame – The basic idea of ​​​​java’s GUI program is based on JFrame. It is the object of the window on the screen and can be maximized, minimized, and closed. .

JPanel – The panel container class in the Java graphical user interface (GUI) toolkit swing, included in the javax.swing package, can be nested, and its function is to perform nesting on components with the same logical function in the form. A combination is a lightweight container that can be added to a JFrame form. .
JLabel – JLabel objects can display text, images, or both. You can specify where the label content is aligned in the label display area by setting the vertical and horizontal alignment. By default, labels are centered vertically within their display area. By default, text-only labels are aligned at the start edge; image-only labels are aligned horizontally and center.
JTextField – A lightweight component that allows editing of single lines of text.
JPasswordField – Allows us to enter a line of text like an input box, but hides the asterisk (*) or click to create a password (password)
JButton – An instance of the JButton class. Used to create buttons similar to "Login" in the example.

Okay, this article comes to an end. What is mentioned here is all basic knowledge. With this foundation, it is not difficult to design a more complex graphical user interface!

For more articles related to the introduction of Java graphical user interface design (Swing), please pay attention to the PHP Chinese website!