fix parallel stream harness

Author: mariofusco

src/main/java/lambdasinaction/chap6/ParallelStreams.java

@@ -6,7 +6,7 @@ public class ParallelStreams {
 
     public static long iterativeSum(long n) {
         long result = 0;
-        for (long i = 0; i < n; i++) {
+        for (long i = 0; i <= n; i++) {
             result += i;
         }
         return result;

src/main/java/lambdasinaction/chap6/ParallelStreamsHarness.java

@@ -8,7 +8,7 @@ public class ParallelStreamsHarness {
     public static final ForkJoinPool FORK_JOIN_POOL = new ForkJoinPool();
 
     public static void main(String[] args) {
-        System.out.println("Iterative Sum done in: " + measurePerf(ParallelStreams::sequentialSum, 10_000_000L) + " msecs");
+        System.out.println("Iterative Sum done in: " + measurePerf(ParallelStreams::iterativeSum, 10_000_000L) + " msecs");
         System.out.println("Sequential Sum done in: " + measurePerf(ParallelStreams::sequentialSum, 10_000_000L) + " msecs");
         System.out.println("Parallel forkJoinSum done in: " + measurePerf(ParallelStreams::parallelSum, 10_000_000L) + " msecs" );
         System.out.println("Range forkJoinSum done in: " + measurePerf(ParallelStreams::rangedSum, 10_000_000L) + " msecs");