ImageIcon lost after creating a runnable JAR file

Question

The project runs fine when I click play in Eclipse but after I created the runnable JAR file, The ImageIcon for the button is gone.
The images are stored within the src folder, uder a subfolder images.
I created the image icon as

Icon playIcon = (Icon) new ImageIcon("src/images/play.png");

Although I am using a relative path, the button does not display images, How do I get the images even in the JAR file?

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Update after Nikolay Kuznetsov's answer

I ended up creating a very unstructured monolithic code for screen recorder and now it is slightly difficult to implement what he said.
I was wondering if there is a way like creating a class or interface that will contain all these resources.

For example:

public class embeddedResources {
    public static Icon blackCursor;
    public static Icon whiteCursor;
    ...
    ...
}  

Then all I have to do is import these statics and in my main ScreenRecorder class,

this.blackCursor = embeddedResources.blackCorsor;

Answer 1

I am using this method to read image into BufferedImage where IconManager is class where it is defined.

private static BufferedImage readBufferedImage (String imagePath) {
    try {
        InputStream is = IconManager.class.getClassLoader().getResourceAsStream(imagePath);
        BufferedImage bimage = ImageIO.read(is);
        is.close();
        return bimage;
    } catch (Exception e) {
        return null;
    }
}