Although
SocketUtils consists solely of static utility methods,
this constructor is intentionally
public.
Rationale
Static methods from this class may be invoked from within XML
configuration files using the Spring Expression Language (SpEL) and the
following syntax.
<bean id="bean1" ... p:port="#{T(org.springframework.util.SocketUtils).findAvailableTcpPort(12000)}" />
If this constructor were
private, you would be required to supply
the fully qualified class name to SpEL's
T() function for each usage.
Thus, the fact that this constructor is
public allows you to reduce
boilerplate configuration with SpEL as can be seen in the following example.
<bean id="socketUtils" class="org.springframework.util.SocketUtils" />
<bean id="bean1" ... p:port="#{socketUtils.findAvailableTcpPort(12000)}" />
<bean id="bean2" ... p:port="#{socketUtils.findAvailableTcpPort(30000)}" />
