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Here are the steps to use the Barcode4j library in Java Swing to create a GS1-128 barcode:

1. Add the Barcode4j jar file to your project's classpath.

2. Create a new GS1-128 barcode object by using the following code:

   Code128Bean code128 = new Code128Bean();
   
   // Set the module width (1 to 5)
   code128.setModuleWidth(UnitConv.inch2mm(0.006)); // 0.006 inches
   
   // Set the barcode height (inches)
   code128.setBarHeight(15);
   
   // Set the quiet zone (inches)
   code128.doQuietZone(true);
   code128.setQuietZoneLeft(0); // 0 inches
   code128.setQuietZoneRight(0); // 0 inches
   

3. Set the data to be encoded in the barcode:

   code128.setCode("1234567890");
   

4. Generate the barcode image as a BufferedImage object:

   BufferedImage bufferedImage = code128.createImageWithBarcode(graphics2D, Color.BLACK, Color.WHITE);
   

   Note: graphics2D should be a valid Graphics2D object.

5. Display the barcode image in a Swing component such as a JLabel or a JPanel:

   ImageIcon imageIcon = new ImageIcon(bufferedImage);
   JLabel label = new JLabel(imageIcon);
   

   Note: You may need to resize the image to fit the component's size.