BAEL-3173

libraries-primitive/pom.xml

@@ -9,6 +9,11 @@
     <version>1.0-SNAPSHOT</version>
     <name>libraries-primitive</name>
 
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
     <dependencies>
         <!-- https://mvnrepository.com/artifact/it.unimi.dsi/fastutil -->
         <dependency>
@@ -36,5 +41,18 @@
             <version>1.19</version>
             <scope>test</scope>
         </dependency>
+        <!-- Eclipse Collections -->
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections-api</artifactId>
+            <version>10.0.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>10.0.0</version>
+        </dependency>
+
     </dependencies>
 </project>

libraries-primitive/src/test/java/com/baeldung/PrimitiveCollectionsUnitTest.java

@@ -0,0 +1,70 @@
+package com.baeldung;
+
+import org.eclipse.collections.api.list.primitive.ImmutableIntList;
+import org.eclipse.collections.api.list.primitive.MutableLongList;
+import org.eclipse.collections.api.map.primitive.MutableIntIntMap;
+import org.eclipse.collections.api.set.primitive.MutableIntSet;
+import org.eclipse.collections.impl.factory.primitive.*;
+import org.eclipse.collections.impl.list.Interval;
+import org.eclipse.collections.impl.list.primitive.IntInterval;
+import org.eclipse.collections.impl.map.mutable.primitive.IntIntHashMap;
+import org.junit.Test;
+
+import java.util.stream.DoubleStream;
+
+import static org.junit.Assert.assertEquals;
+
+
+public class PrimitiveCollectionsUnitTest {
+
+    @Test
+    public void whenListOfLongHasOneTwoThree_thenSumIsSix() {
+        MutableLongList longList = LongLists.mutable.of(1L, 2L, 3L);
+        assertEquals(6, longList.sum());
+    }
+
+    @Test
+    public void whenListOfIntHasOneTwoThree_thenMaxIsThree() {
+        ImmutableIntList intList = IntLists.immutable.of(1, 2, 3);
+        assertEquals(3, intList.max());
+    }
+
+    @Test
+    public void whenConvertFromIterableToPrimitive_thenValuesAreEquals() {
+        Iterable<Integer> iterable = Interval.oneTo(3);
+        MutableIntSet intSet = IntSets.mutable.withAll(iterable);
+        IntInterval intInterval = IntInterval.oneTo(3);
+        assertEquals(intInterval.toSet(), intSet);
+    }
+
+    @Test
+    public void testOperationsOnIntIntMap() {
+        MutableIntIntMap map = new IntIntHashMap();
+        assertEquals(5, map.addToValue(0, 5));
+        assertEquals(5, map.get(0));
+        assertEquals(3, map.getIfAbsentPut(1, 3));
+    }
+
+    @Test
+    public void whenCreateDoubleStream_thenAverageIsThree() {
+        DoubleStream doubleStream = DoubleLists
+                .mutable.with(1.0, 2.0, 3.0, 4.0, 5.0)
+                .primitiveStream();
+        assertEquals(3, doubleStream.average().getAsDouble(), 0.001);
+    }
+
+    @Test
+    public void whenCreateMapFromStream_thenValuesMustMatch() {
+        Iterable<Integer> integers = Interval.oneTo(3);
+        MutableIntIntMap map =
+                IntIntMaps.mutable.from(
+                        integers,
+                        key -> key,
+                        value -> value * value);
+        MutableIntIntMap expected = IntIntMaps.mutable.empty()
+                .withKeyValue(1, 1)
+                .withKeyValue(2, 4)
+                .withKeyValue(3, 9);
+        assertEquals(expected, map);
+    }
+}