### Question:
Base64 extends BaseNCodec { public boolean isUrlSafe() { return this.encodeTable == URL_SAFE_ENCODE_TABLE; } Base64();  Base64(final boolean urlSafe);  Base64(final int lineLength);  Base64(final int lineLength, final byte[] lineSeparator);  Base64(final int lineLength, final byte[] lineSeparator, final boolean urlSafe); boolean isUrlSafe(); @Deprecated static boolean isArrayByteBase64(final byte[] arrayOctet); static boolean isBase64(final byte octet); static boolean isBase64(final String base64); static boolean isBase64(final byte[] arrayOctet); static byte[] encodeBase64(final byte[] binaryData); static String encodeBase64String(final byte[] binaryData); static byte[] encodeBase64URLSafe(final byte[] binaryData); static String encodeBase64URLSafeString(final byte[] binaryData); static byte[] encodeBase64Chunked(final byte[] binaryData); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked, final boolean urlSafe); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked,
                                      final boolean urlSafe, final int maxResultSize); static byte[] decodeBase64(final String base64String); static byte[] decodeBase64(final byte[] base64Data); static BigInteger decodeInteger(final byte[] pArray); static byte[] encodeInteger(final BigInteger bigInt);  }### Answer:
@Test public void testIsUrlSafe() { final Base64 base64Standard = new Base64(false); final Base64 base64URLSafe = new Base64(true); assertFalse("Base64.isUrlSafe=false", base64Standard.isUrlSafe()); assertTrue("Base64.isUrlSafe=true", base64URLSafe.isUrlSafe()); final byte[] whiteSpace = {' ', '\n', '\r', '\t'}; assertTrue("Base64.isBase64(whiteSpace)=true", Base64.isBase64(whiteSpace)); }