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import javax.swing.*;
public class HelloWorldSwing {
    /**{
     * Create and display the GUI. For thread safety,
     * this method is called in the event dispatching thread.
     */
    private static void createAndShowGUI() {
        // Ensure a nice look and feel
        JFrame.setDefaultLookAndFeelDecorated(true);

        // Create and set up the window
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Add a "Hello World" label
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        // Display the window
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        // Display the application GUI
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

$ javac HelloWorldSwing.java
$ java HelloWorldSwing

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField; 
public class SwingLoginExample {

    public static void main(String[] args) {    
        // Create a JFrame instance
        JFrame frame = new JFrame("Login Example");
        // Set the width and height of the frame
        frame.setSize(350, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        /* Create a panel, similar to the div tag in HTML
         * We can create multiple panels and specify their positions
         * in the JFrame, and we can add text fields, buttons, and other components to the panels.
         */
        JPanel panel = new JPanel();    
        // Add the panel
        frame.add(panel);
        /* 
         * Call the user-defined method and add components to the panel
         */
        placeComponents(panel);

        // Set the interface to be visible
        frame.setVisible(true);
    }

    private static void placeComponents(JPanel panel) {

        /* We won't go into the layout part here
         * Here we set the layout to null
         */
        panel.setLayout(null);

        // Create a JLabel
        JLabel userLabel = new JLabel("User:");
        /* This method defines the position of the component.
         * setBounds(x, y, width, height)
         * x and y specify the new position of the top-left corner, and width and height specify the new size.
         */
        userLabel.setBounds(10,20,80,25);
        panel.add(userLabel);

        /* 
         * Create a text field for user input
         */
        JTextField userText = new JTextField(20);
        userText.setBounds(100,20,165,25);
        panel.add(userText);

        // Text field for entering the password
        JLabel passwordLabel = new JLabel("Password:");
        passwordLabel.setBounds(10,50,80,25);
        panel.add(passwordLabel);

        /* 
         * This is similar to the text field for input
         * but the entered information is replaced with dots for the security of the password
         */
        JPasswordField passwordText = new JPasswordField(20);
        passwordText.setBounds(100,50,165,25);
        panel.add(passwordText);

        // Create a login button
        JButton loginButton = new JButton("login");
        loginButton.setBounds(10, 80, 80, 25);
        panel.add(loginButton);
    }

}

$ javac SwingLoginExample.java
$ java SwingLoginExample