How java is going to achieve asynchronous calls

How java is going to achieve asynchronous calls(Ex. calls from a web service)Is it doing by using threads or some other technique to do this?
[162 byte] By [jugpa] at [2007-10-3 5:22:29]
# 1
I do not know whether there is any published API to do asynchronous invokations. If you write one you will have to use the threads to implement it.
LRMKa at 2007-7-14 23:29:32 > top of Java-index,Java Essentials,Java Programming...