BufferedImage im = ImageIO.read(file);
// There is also a reformatting option, but I don't remember it offhand and my code is not nearby

import javax.swing.JPanel;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.awt.Graphics;
import java.io.File;

class MyPanel extends JPanel {

   private BufferedImage im;

   public MyPanel() {
       try {
           im = ImageIO.read(new File(path));  // Where 'path' is whatever you're testing as an image
       }
       catch (IOException e) {
           e.printStackTrace();
           System.exit(1);
       }
   }

   public void paintComponent(Graphics g) {
       g.drawImage(im, 0, 0, null);
   }
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
*      This class demonstrates how to use an ImageIcon
*      and a JLabel to display an image.
*/

public class MyImage extends JFrame
{
   private JPanel imagePanel;      // To hold the label
   private JPanel buttonPanel;     // To hold a button
   private JLabel imageLabel;      // To show an image
   private JButton button;         // To get an image
   
   /**
    *      Constructor
    */
   
   public MyImage()
   {
       // Set the title.
       setTitle("My Image");
       
       // Specify an action for the close button.
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       
       // Create a BorderLayout manager.
       setLayout(new BorderLayout());
       
       // Build the panels.
       buildImagePanel();
       buildButtonPanel();
       
       // Add the panels to the content pane.
       add(imagePanel, BorderLayout.CENTER);
       add(buttonPanel, BorderLayout.SOUTH);
       
       // Pack and display the window.
       pack();
       setVisible(true);
   }
   
   /**
    *      The buildImagePanel method adds a label to a panel.
    */
   
   private void buildImagePanel()
   {
       // Create a panel.
       imagePanel = new JPanel();
       
       // Create a label.
       imageLabel = new JLabel("Click the button to see an image.");
       
       // Add the label to the panel.
       imagePanel.add(imageLabel);
   }
   
   /**
    *      The buildButtonPanel method adds a button
    *      to a panel.
    */
   
   private void buildButtonPanel()
   {
       ImageIcon smileyImage;
       
       // Create a panel.
       buttonPanel = new JPanel();
       
       // Get the smiley face image.
       smileyImage = new ImageIcon("Smiley.gif");
       
       // Create a button.
       button = new JButton("Get Image");
       button.setIcon(smileyImage);
       
       // Register an action listener with the button.
       button.addActionListener(new ButtonListener());
       
       // Add the button to the panel.
       buttonPanel.add(button);
   }
   
   /**
    *      Private inner class that handles the event when
    *      the user clicks the button.
    */
   
   private class ButtonListener implements ActionListener
   {
       public void actionPerformed(ActionEvent e)
       {
           // Read the image file into an ImageIcon object.
           ImageIcon myImage = new ImageIcon("MyImage.jpg");
           
           // Display the image in the label.
           imageLabel.setIcon(myImage);
           
           // Remove the text from the label.
           imageLabel.setText(null);
           
           // Pack the frame again to accomodate the
           // new size of the label.
           pack();
       }
   }
   
   /**
    *      The main method creates an instance of the
    *      MyImage class, which causes it to display
    *      its window.
    */
   
    public static void main(String[] args)
    {
        new MyImage();
    }
}

button.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
       // do stuff here
   }
});

    private static JButton button1 = new JButton("Button One");
    private static JButton button2 = new JButton("Button Two");

        button1.addActionListener(new button1Listener());
        button2.addActionListener(new button2Listener());

    private static class button1Listener implements ActionListener
    {
        public void actionPerformed (ActionEvent event)
        {
            System.out.println("You pressed button one");
        }
    }

    private static class button2Listener implements ActionListener
    {
        public void actionPerformed (ActionEvent event)
        {
            System.out.println("You pressed button two");
        }
    }

package imageTesting;

import javax.swing.JPanel;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.awt.Graphics;
import java.io.File;
import java.io.*;

class ImageTest extends JPanel {

  private BufferedImage im;

  public void ImageLoad() {
      try {
          im = ImageIO.read(new File("mypic.png"));  // Where 'path' is whatever you're testing as an image
      }
      catch (IOException e) {
          e.printStackTrace();
          System.exit(1);
      }
  }

  public void paintComponent(Graphics g) {
      g.drawImage(im, 0, 0, null);
  }
}

package imageTesting;

import javax.swing.*;

public class ImageTestMain {
   
    public static void main(String args[])
    {
        JFrame frame = new JFrame("Show the damn image already");
        JPanel MyPanel = new JPanel();
        MyPanel.ImageLoad();
   
        frame.add(MyPanel);
        frame.getContentPane();
        frame.pack();
        frame.setVisible(true);
       
    }

}