Java Tutorial: The 'Hello World' Applet - Part 5
The standard Java graphics library does not contain a drawPixel method, but there are plenty of ways to render graphics at the pixel level in Java. In this ShowMeDo John makes use of a BufferedImage so that an array of integers can be used as pixels for rendering on screen.
See additional information and source code in the wiki(JavaMontgomeryAppletSeries).
Video is here.