See java-app-icons-bin for an executable CLI. It works a bit different for Google Play. In this case one may specify an arbitrary list of icon sizes as integer values. The naming of the files can be ...

IconEdit is a Java 1.4 graphical (GUI) application to edit icon files for Windows. An icon file has several images in sizes like 16x16, 24x24, 32x32, 48x48, and 64x64 pixels. Icons are square from 8x8 ...

Until recently, it has been quite difficult to create Java based tray icons applications. JavaSE 6 (aka Mustang) now supports tray icon development with the TrayIcon API.