what is diff between syncronous and Asyncronous webservice call in java?

[Suresh Sudineni]

what is diff between syncronous and Asyncronous webservice call in java? what is the code differences to implement this?
in code what we have to change for syscronous and Asyncronous webservice calls in java?

[Jim Pouwels]

A synchronous webservice call immediately results in a response containing the data you're requesting.

An asynchronous webservice call does not return the result in the first response. Either the client has to request the result later (f.e. using a requestId), or the server sends the result back to the client (f.e. using a callback address).