### Question:
SimpleExample { public void outputFormat() throws IOException { System.out.println("==========转化图片格式============"); String destFile = saveDir + "/outputFormat.png"; Thumbnails.of(imgFile) .scale(1.0f) .outputFormat("png") .toFile(destFile); printlnImageInfo(destFile); System.out.println("\r\n"); } SimpleExample(String saveDir); void reSize(); void scale(); void forceReSize(); void rotate(); void watermark(); void sourceRegion(); void outputFormat(); void listFilesChange(); static void printlnImageInfo(String imgFile);  }### Answer:
@Test public void outputFormat() throws IOException { simpleExample.outputFormat(); }