/**
* Gets the fully qualified domain name for this IP address. Best effort method, meaning we may
* not be able to return the FQDN depending on the underlying system configuration.
*
* <p>If there is a security manager, this method first calls its <code>checkConnect</code> method
* with the hostname and <code>-1</code> as its arguments to see if the calling code is allowed to
* know the hostname for this IP address, i.e., to connect to the host. If the operation is not
* allowed, it will return the textual representation of the IP address.
*
* @return the fully qualified domain name for this IP address, or if the operation is not allowed
* by the security check, the textual representation of the IP address.
* @see SecurityManager#checkConnect
* @since 1.4
*/
public String getCanonicalHostName() {
if (canonicalHostName == null) {
canonicalHostName = InetAddress.getHostFromNameService(this, true);
}
return canonicalHostName;
}
/**
* Returns the hostname for this address. If the host is equal to null, then this address refers
* to any of the local machine's available network addresses. this is package private so
* SocketPermission can make calls into here without a security check.
*
* <p>If there is a security manager, this method first calls its <code>checkConnect</code> method
* with the hostname and <code>-1</code> as its arguments to see if the calling code is allowed to
* know the hostname for this IP address, i.e., to connect to the host. If the operation is not
* allowed, it will return the textual representation of the IP address.
*
* @return the host name for this IP address, or if the operation is not allowed by the security
* check, the textual representation of the IP address.
* @param check make security check if true
* @see SecurityManager#checkConnect
*/
String getHostName(boolean check) {
if (hostName == null) {
hostName = InetAddress.getHostFromNameService(this, check);
}
return hostName;
}