Having connected, you wish to transfer binary data.

Construct a
`DataInputStream`

or `DataOutputStream`

from the socket’s `getInputStream( )`

or
`getOutputStream( )`

.

The simplest paradigm is:

DataInputStream is = new DataInputStream(sock.getInputStream( )); DataOutputStream is = new DataOutputStream(sock.getOutputStream( ));

If the volume of data might be large, insert a buffered stream for efficiency. The paradigm is:

DataInputStream is = new DataInputStream( new BufferedInputStream(sock.getInputStream( ))); DataOutputStream is = new DataOutputStream( new BufferedOutputStream(sock.getOutputStream( )));

This program uses another standard service that gives out the time,
this time as a binary integer representing the number of
seconds since 1900. Since the Java `Date`

class base
is 1970, we convert the time base by subtracting the difference
between 1970 and 1900. When I used this exercise in a course, most of
the students wanted to *add* this time difference,
reasoning that 1970 is later. But if you think clearly, you’ll
see that there are fewer seconds between 1999 and 1970 than there are
between 1999 and 1900, so subtraction gives the correct number of
seconds. And since the `Date`

constructor needs
milliseconds, we multiply the number of seconds by 1,000.

The time base difference is the number of years multiplied by 365.25, multiplied by the number of seconds in a day. The earth’s mean orbital period is approximately 365.23 days, ...

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