Java Swing Program to demonstrate Jlabel

Program

import javax.swing.*;
public class JLabelDemo
{
	public static void main(String args[])
	{
		JFrame frm = new JFrame("JLabel Demo");
		JLabel lblUserName, lblPassword;
		lblUserName = new JLabel("User Name:");
		lblUserName.setBounds(0, 0, 100, 50);
		lblPassword = new JLabel("Password:");
		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 the use of JLabel, a component in the Swing library used for displaying text or images.

1. Import Swing Package:

   • The javax.swing.* package is imported to use Swing components like JFrame and JLabel.

2. Main Components:

   • JFrame: A container that acts as the main window for the application.
   • JLabel: A Swing component used to display static text or images.

3. Creating a JFrame:

   • A JFrame object (frm) is created with the title "JLabel Demo".
   • The setSize() method is used to set the frame dimensions (300x300 pixels).
   • The setLayout(null) method allows absolute positioning of components.

4. Creating JLabels:

   • Two JLabel objects (lblUserName and lblPassword) are created with text "User Name:" and "Password:", respectively.
   • The setBounds() method sets the position and dimensions for each label. For example:
     • lblUserName starts at (0, 0) with width 100 and height 50 pixels.
     • lblPassword starts at (0, 50) with width 100 and height 50 pixels.

5. Adding Labels to JFrame:

   • Both JLabel objects are added to the JFrame using the add() method.

6. Frame Visibility and Behavior:

   • The setVisible(true) method makes the frame visible.
   • The setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ensures the application exits when the window is closed.

7. Key Swing Methods Used:

   • JLabel(String text): Creates a label with the specified text.
   • setBounds(int x, int y, int width, int height): Sets the position and size of the label.
   • add(Component comp): Adds a component (e.g., JLabel) to the frame.
   • setLayout(LayoutManager mgr): Specifies the layout manager; null enables absolute positioning.
   • setDefaultCloseOperation(int operation): Defines the behavior when the window is closed.

Output