File file = new File( "project.xml" );
String display = FileUtils.byteCountToDisplaySize( file.length() );
System.out.println( "project.xml is " + display );
System.out.println( "Byte in KB: " + FileUtils.ONE_GB );
display = FileUtils.byteCountToDisplaySize( 12073741824l );
System.out.println( "size: " + display );