diff --git a/core-java/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStream.java b/core-java/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStream.java
index d654f45626..fdf593ba64 100644
--- a/core-java/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStream.java
+++ b/core-java/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStream.java
@@ -1,38 +1,34 @@
 package org.baeldung.java.streams;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ForkJoinPool;
+import java.util.stream.Collectors;
+import java.util.stream.LongStream;
 import java.util.stream.Stream;
 
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 public class ThreadPoolInParallelStream {
     
     @Test
     public void giveRangeOfLongs_whenSummedInParallel_shouldBeEqualToExpectedTotal() 
         throws InterruptedException, ExecutionException {
-        List<Long> aList = new ArrayList<>();        
-        long lastNum = 1_000_000;    
         long firstNum = 1;
-        
-        long expectedTotal = (lastNum + firstNum) * lastNum / 2;
-        
-        for(long i = firstNum; i <= lastNum; i++){
-            aList.add(i);
-        } 
-        
+        long lastNum = 1_000_000;
+
+        List<Long> aList = LongStream.range(firstNum, lastNum).boxed()
+          .collect(Collectors.toList());
+
         ForkJoinPool customThreadPool = new ForkJoinPool(4);
-        long actualTotal = customThreadPool.submit(() -> aList.parallelStream().reduce(
-            0L, (x, y) -> { 
-                return x + y;
-            })).get();
+        long actualTotal = customThreadPool.submit(() -> aList.parallelStream()
+          .reduce(0L, Long::sum)).get();
         
-        assertEquals(expectedTotal, actualTotal);
+        assertEquals((lastNum + firstNum) * lastNum / 2, actualTotal);
     }
     
     @Test