Inet4Address and Inet6Address
Java includes support for both IPv4 and IPv6 addresses. Because of this, two subclasses of InetAddress were created: Inet4Address and Inet6Address. Inet4Address represents a traditional-style IPv4 address. Inet6Address encapsulates a newer IPv6 address. Because they are subclasses of InetAddress, an InetAddress reference can refer to either. This is one way that Java was able to add IPv6 functionality without breaking existing code or adding many more classes. For the most part, you can simply use InetAddress when working with IP addresses because it can accommodate both styles.
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