### Question:
FileHelper { public static String readContents(File file) { try (FileInputStream in = new FileInputStream(file)) { Long filelength = file.length(); byte[] filecontent = new byte[filelength.intValue()]; in.read(filecontent); return new String(filecontent); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; }  static void handlerWithLine(File file, String encoding, ObjectHandler<String> handler); static void processWithLine(File file, String encoding, Collection<E> result, ObjectProcess<String, E> process); static int lineCounts(File file); static List<String> readLines(File file); static List<String> readLines(File file, String encoding); static String readContents(File file); final static boolean createFiles(File file); final static boolean createFiles(File file, boolean isReNew); static boolean write(File file, String str); static boolean write(File file, String str, String encoding); static boolean addWrite(File file, String str); static boolean addWrite(File file, String str, String encoding); static boolean copy(File resource, File target); static boolean copyFile(File file, File targetFile); static boolean cleanFile(File file); static boolean delete(File file); static List<File> listFile(File path); static List<File> listFileSuffix(File dirPath, String postfixs); static List<File> listFileName(File dirPath, String fileName); static List<File> listFileNameIgnoreCase(File dirPath, String fileName); static List<File> listFileFilter(File path, ObjectFilter filter); static List<File> listFileNameReg(File dirPath, Pattern pattern); static List<File> listFileWithHandler(File path, ObjectProcess<File, File> handler); static boolean createFile(String path); static String suffix(File file); static String fileHash(File file, String HashTyle); static String simpleEncoding(File file); static boolean zipDeCompress(File file, String zipFile); static boolean zipUnCompress(File zipFile, String path);  }### Answer:
@Test public void readFile() { String content = FileHelper.readContents(new File(TestUtil.path + "/text/English.txt")); System.out.println("content:" + content); }