Simulating a Stack using Queues

can anyone help me with the concept of simulating a stack using 2 queues? I'm not quite sure the theory behind this or how to begin implementing it. thanks for the help!
[177 byte] By [johnsmith954a] at [2007-11-26 19:22:48]
# 1
Double posted. http://forum.java.sun.com/thread.jspa?threadID=5140172&tstart=0
floundera at 2007-7-9 21:43:47 > top of Java-index,Java Essentials,New To Java...