Display Frame After Some Seconds in Java

In this article, we will learn how to display a frame after a few seconds in Java using the Timer class. This example shows how to delay the visibility of a frame by 2 seconds using Swing.

Timer() class

The Timer class is used to schedule tasks that execute after a specific time interval or repeatedly at regular intervals. It allows tasks to be run by a thread that handles the scheduling and execution. Each task can be set to execute either once or repeatedly at fixed intervals. The execution of all tasks is managed by a background thread associated with the Timer object.

• The Timer class is thread-safe, meaning it can safely be used in multi-threaded environments.
  
• The Timer class uses a binary heap data structure to efficiently store and manage scheduled tasks.
  Constructors:

Constructors

• Timer(): Initializes a new timer with a default configuration.
  
• Timer(boolean isDaemon): Initializes a new timer, with the option to specify whether its background thread should be a daemon thread.
  
• Timer(String name): Creates a new timer with a specified name for its background thread.
  
• Timer(String name, boolean isDaemon): Initializes a timer with a specified name for the background thread, and allows setting whether the thread should run as a daemon.

Use Timer() to set seconds for delay i.e. to display the frame after a few seconds ?

Timer tm = new Timer(2000, new ActionListener() {
 //
}

Steps to display frame after some seconds

The following are the steps to display the frame after some seconds ?

• Step 1. Setting up the Frame: A new frame is created, with the size set and a default close operation defined. A JFrame is initialized and configured with a size of 550x300. The EXIT_ON_CLOSE operation is set, so the program terminates when the frame is closed.
  

private JFrame frame = new JFrame();

frame.setSize(550, 300);

• Step 2. Initial Frame Visibility: The frame is initially set to an iconified state, making it minimized when first displayed. This code sets the frame to be visible but starts in a minimized (iconified) state, meaning it won't appear in its full window size immediately.
  

frame.setVisible(true);

frame.setExtendedState(JFrame.ICONIFIED);

• Step 3. Using Timer for Delay: A Timer object is created to introduce a 2-second delay before making the frame visible in its normal state. A Timer is initialized with a 2000 millisecond (2-second) delay. When the timer triggers, the frame is restored to its normal state. The setRepeats(false) ensures this only happens once.
  

Timer tm = new Timer(2000, new ActionListener() {

   @Override

   public void actionPerformed(ActionEvent arg0) {

      java.awt.EventQueue.invokeLater(new Runnable() {

         @Override

         public void run() {

            frame.setExtendedState(JFrame.NORMAL);

         }

      });

   }

});

tm.setRepeats(false);

tm.start();

Java program to display frame after some seconds

The following is an example to display Frame after some seconds ?

package my;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.Timer;
public class SwingDemo extends JFrame {
	private JFrame frame = new JFrame();
	public SwingDemo() {
		frame.setSize(550, 300);
		frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
		frame.setVisible(true);
		frame.setExtendedState(JFrame.ICONIFIED);
		Timer tm = new Timer(2000, new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent arg0) {
				java.awt.EventQueue.invokeLater(new Runnable() {
					@Override
					public void run() {
						frame.setExtendedState(JFrame.NORMAL);
					}
				});
			}
		});
		tm.setRepeats(false);
		tm.start();
	}
	public static void main(String[] args) {
		new SwingDemo();
	}
}

The output is as follows displaying that the Frame appears after 2 seconds ?

Output