How to use the JavaSwingJPanel panel

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1. Overview

Official JavaDocsApi: javax.swing.JPanel

JPanel, panel. JPanel is a general lightweight panel container component that is frequently used in development.

Common construction methods of JPanel:

/ / create a panel JPanel () that uses streaming layout by default / / create a panel JPanel (LayoutManager layout) that specifies the layout manager

two。 Code example

Package com.xiets.swing;import javax.swing.*;import java.awt.*;public class Main {public static void main (String [] args) {JFrame jf = new JFrame ("user login"); jf.setDefaultCloseOperation (WindowConstants.EXIT_ON_CLOSE); / / 1st JPanel, using the default floating layout JPanel panel01 = new JPanel (); panel01.add (new JLabel ("username")); panel01.add (new JTextField (10)) / / 2nd JPanel, using the default floating layout JPanel panel02 = new JPanel (); panel02.add (new JLabel ("password")); panel02.add (new JPasswordField (10)); / / 3rd JPanel, using floating layout, and the components in the container are centered with JPanel panel03 = new JPanel (new FlowLayout (FlowLayout.CENTER)); panel03.add (new JButton ("login")); panel03.add (new JButton ("registration")) / / create a vertical box container and add the above three JPanel as content panels to the window Box vBox = Box.createVerticalBox (); vBox.add (panel01); vBox.add (panel02); vBox.add (panel03); jf.setContentPane (vBox); jf.pack (); jf.setLocationRelativeTo (null); jf.setVisible (true);}}

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