### Question:
IpUtils { public boolean isDecimalIpAddress(String ip) { return DECIMAL_PATTERN.matcher(ip).matches(); }  boolean isIpAddress(String ip); boolean isDecimalIpAddress(String ip); boolean isBinaryIpAddress(String ip); boolean isOctalEncodedIpAddress(String ip); boolean isHexEncodedIpAddress(String ip); boolean isNumericIpAddress(String ip); InetAddress toInetAddress(String ip);  }### Answer:
@Test public void testIsDecimalIpAddress() { Assert.assertTrue(ipUtils.isDecimalIpAddress(ipDec)); Assert.assertFalse(ipUtils.isDecimalIpAddress(ipHex)); Assert.assertFalse(ipUtils.isDecimalIpAddress(ipOct)); Assert.assertFalse(ipUtils.isDecimalIpAddress(ipBin)); Assert.assertFalse(ipUtils.isDecimalIpAddress(ipNum)); }