Java concurrent Programming-thread safety 1:servlet access statistics

Non-Secure:

@NotThreadSafepublic class Unsafecountingfactorizer extends Genericservlet implements Servlet {    private Long Count = 0;    Public long GetCount () {        return count;    }    public void Service (ServletRequest req, Servletresponse resp) {        BigInteger i = extractfromrequest (req);        biginteger[] factors = factor (i);        ++count;        Encodeintoresponse (resp, factors);    }    void Encodeintoresponse (Servletresponse res, biginteger[] factors) {    }    BigInteger extractfromrequest ( ServletRequest req) {        return new BigInteger ("7");    }    Biginteger[] Factor (BigInteger i) {        //doesn ' t really factor        return new biginteger[] {i};    }}

Safety:

@ThreadSafepublic class Countingfactorizer extends Genericservlet implements Servlet {    private final Atomiclong Count = new Atomiclong (0);    Public long GetCount () {return count.get ();}    public void Service (ServletRequest req, Servletresponse resp) {        BigInteger i = extractfromrequest (req);        biginteger[] factors = factor (i);        Count.incrementandget ();        Encodeintoresponse (resp, factors);    }    void Encodeintoresponse (Servletresponse res, biginteger[] factors) {}    BigInteger extractfromrequest ( ServletRequest req) {return null;}    Biginteger[] Factor (BigInteger i) {return null;}}

Java concurrent Programming-thread safety 1:servlet access statistics