### Question:
GuidGenerator { public static String generateClientSecret() { return RandomStringUtils.random(20, true, true); } private  GuidGenerator(); static String generate(); static String generateClientId(); static String generateClientSecret();  }### Answer:
@Test public void testGenerateClientSecret() throws Exception { final String clientSecret = GuidGenerator.generateClientSecret(); assertNotNull(clientSecret); assertTrue(clientSecret.length() == 20); System.out.println(clientSecret); for (int i = 0; i < 5; i++) { System.out.println(GuidGenerator.generateClientSecret()); } }