Title: Array vs List Performance in Java (#14034)

This commit related to the article entitled "Array vs List Performance in Java".

core-java-modules/core-java-collections-5/src/main/java/com/baeldung/arrayandlistperformance/ArrayAndArrayListPerformance.java

@@ -0,0 +1,88 @@
+package com.baeldung.arrayandlistperformance;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import java.util.ArrayList;
+import java.util.concurrent.TimeUnit;
+
+@State(Scope.Benchmark)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+public class ArrayAndArrayListPerformance {
+
+    public static void main(String[] args) throws Exception {
+        org.openjdk.jmh.runner.Runner runner = new org.openjdk.jmh.runner.Runner(new OptionsBuilder().include(ArrayAndArrayListPerformance.class.getSimpleName()).forks(1).build());
+        runner.run();
+    }
+
+    @Benchmark
+    public void arrayCreation(Blackhole blackhole) {
+        int[] array = new int[1000000];
+        blackhole.consume(array);
+    }
+
+    @Benchmark
+    public void arrayListCreation(Blackhole blackhole) {
+        ArrayList<Integer> list = new ArrayList<>(1000000);
+        blackhole.consume(list);
+    }
+
+    @Benchmark
+    public void arrayItemsSetting(Blackhole blackhole) {
+        int[] array = new int[1000000];
+        for (int i = 0; i < 1000000; i++) {
+            array[i] = i;
+        }
+        blackhole.consume(array);
+
+    }
+
+    @Benchmark
+    public void arrayListItemsSetting(Blackhole blackhole) {
+        ArrayList<Integer> list = new ArrayList<>(1000000);
+        for (int i = 0; i < 1000000; i++) {
+            list.add(i);
+        }
+        blackhole.consume(list);
+    }
+
+    @Benchmark
+    public void arrayItemsRetrieval(Blackhole blackhole) {
+        int[] array = new int[1000000];
+        for (int i = 0; i < 1000000; i++) {
+            array[i] = i;
+        }
+        for (int i = 0; i < 1000000; i++) {
+            int item = array[i];
+            blackhole.consume(item);
+        }
+    }
+
+    @Benchmark
+    public void arrayListItemsRetrieval(Blackhole blackhole) {
+        ArrayList<Integer> list = new ArrayList<>();
+        for (int i = 0; i < 1000000; i++) {
+            list.add(i);
+        }
+        for (int i = 0; i < 1000000; i++) {
+            int item = list.get(i);
+            blackhole.consume(item);
+        }
+    }
+
+    @Benchmark
+    public void arrayCloning(Blackhole blackhole) {
+        int[] array = new int[1000000];
+        int[] newArray = array.clone();
+        blackhole.consume(newArray);
+    }
+
+    @Benchmark
+    public void arrayListCloning(Blackhole blackhole) {
+        ArrayList<Integer> list = new ArrayList<>(1000000);
+        ArrayList<Integer> newList = new ArrayList<>(list);
+        blackhole.consume(newList);
+    }
+}