Java Swing Program to demonstrate JLabel with Icon

Program

import javax.swing.*;
public class JLabelIconDemo
{
	public static void main(String args[])
	{
		JFrame frm = new JFrame("JLabel Demo");
		JLabel lblUserName, lblPassword;
		ImageIcon icoUserName, icoPassword;
		icoUserName = new ImageIcon("username.png");		
		lblUserName = new JLabel(icoUserName);
		lblUserName.setBounds(0, 0, 100, 50);
		icoPassword = new ImageIcon("password.png");
		lblPassword = new JLabel(icoPassword);
		lblPassword.setBounds(0, 50, 100, 50);
		frm.add(lblUserName);
		frm.add(lblPassword);
		frm.setSize(300, 300); 
		frm.setLayout(null);
		frm.setVisible(true);
		frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

This Java Swing program demonstrates how to use JLabel with icons (ImageIcon). It displays two labels, each with an image icon representing a "username" and "password" label.

1. Import Swing Package:

   • The javax.swing.* package is imported to use JFrame, JLabel, and ImageIcon components.

2. Main Components:

   • JFrame: A container used to create the main application window.
   • JLabel: A component used to display text or images. In this case, it is used to display images (icons).
   • ImageIcon: A class used to create an icon from an image file, which can be displayed on a label.

3. Creating a JFrame:

   • A JFrame object (frm) is created with the title "JLabel Demo".
   • The setSize(300, 300) method defines the window size (300x300 pixels).
   • setLayout(null) allows for absolute positioning of components within the frame.

4. Creating Image Icons:

   • ImageIcon icoUserName = new ImageIcon("username.png"): This creates an ImageIcon from an image file (e.g., username.png).
   • ImageIcon icoPassword = new ImageIcon("password.png"): This creates another ImageIcon from the image file password.png.

5. Creating JLabels with Icons:

   • lblUserName = new JLabel(icoUserName): This creates a JLabel that will display the icoUserName image.
   • lblPassword = new JLabel(icoPassword): This creates another JLabel that will display the icoPassword image.
   • The setBounds(x, y, width, height) method is used to position and size the labels on the frame.

6. Adding Labels to JFrame:

   • Both JLabel components (lblUserName and lblPassword) are added to the JFrame using add() method.

7. Frame Visibility and Behavior:

   • The setVisible(true) method makes the frame visible on the screen.
   • The setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) method ensures the program terminates when the window is closed.

8. Key Swing Methods Used:

   • JLabel(ImageIcon icon): Creates a label with an icon (image).
   • setBounds(int x, int y, int width, int height): Positions and sizes the label in the frame.
   • add(Component comp): Adds components like labels to the frame.
   • setDefaultCloseOperation(int operation): Defines the window's close behavior (e.g., exit the program when closed).
   • setVisible(boolean visibility): Makes the frame visible.

Output