Its very useful ant java developers Create it at the top level of your project directory (New --> File, create as a simplefile) and name it build.xml. Copy and paste the xml text from Figure 3 into your build.xml file and save it.-Its very useful ant java developers Create it at the top level of your project directory (New--> File, create as a simplefile) and name it build.xml. Copy and paste the xml text from Figure 3 into your build.xml file and save it.