Calling Threads from servlet

[Priya Venkatesan]

Iam not sure what will be the effect of doing the foll:
Servlet spawns off a thread and passes on parameters a2,b2,c2. Inside this thread I have member variables.
public class A extends Thread
String a;
String b;
String c;
{
public A(a1,b1,c1)
{
this.a = a1;
this.b = b1;
this.c = c1;
}
}
Is this thread safe? Iam confused.
Generally, by declaring member variables, each instance has its own copy and dont share it isnt? What about the above scenario?

[David Weitzman]

A field can't simply be thread safe, although since String is immutable in the example you give there almost definately wouldn't be any thread safety issues so long as the fields are only accessed from within a single running thread. If you start the thread multiple times or access the fields from another thread, though, all bets are off.