primitive map libraries

libraries/pom.xml

@@ -373,6 +373,21 @@
             <artifactId>eclipse-collections</artifactId>
             <version>${eclipse-collections.version}</version>
         </dependency>
+        <dependency>
+            <groupId>net.sf.trove4j</groupId>
+            <artifactId>trove4j</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        <dependency>
+            <groupId>it.unimi.dsi</groupId>
+            <artifactId>fastutil</artifactId>
+            <version>8.1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>colt</groupId>
+            <artifactId>colt</artifactId>
+            <version>1.2.0</version>
+        </dependency>
         <dependency>
             <groupId>io.vavr</groupId>
             <artifactId>vavr</artifactId>

libraries/src/main/java/com/baeldung/primitives/PrimitiveMaps.java

@@ -0,0 +1,54 @@
+package com.baeldung.primitives;
+
+import cern.colt.map.AbstractIntDoubleMap;
+import cern.colt.map.OpenIntDoubleHashMap;
+import gnu.trove.map.TDoubleIntMap;
+import gnu.trove.map.hash.TDoubleIntHashMap;
+import org.eclipse.collections.api.map.primitive.*;
+import org.eclipse.collections.impl.factory.primitive.*;
+
+public class PrimitiveMaps {
+
+    public static void main(String[] args) {
+
+        eclipseCollectionsMap();
+        troveMap();
+        coltMap();
+    }
+
+    private static void coltMap() {
+        AbstractIntDoubleMap map = new OpenIntDoubleHashMap();
+        map.put(1, 4.5);
+    }
+
+    private static void eclipseCollectionsMap() {
+        MutableObjectDoubleMap<String> doubleMap = ObjectDoubleMaps.mutable.empty();
+        doubleMap.put("1", 1.0d);
+        doubleMap.put("2", 2.0d);
+
+        MutableObjectIntMap<String> booleanMap = ObjectIntMaps.mutable.empty();
+        booleanMap.put("ok", 1);
+
+        MutableIntIntMap mutableIntIntMap = IntIntMaps.mutable.empty();
+        mutableIntIntMap.addToValue(1, 1);
+
+        ImmutableIntIntMap immutableIntIntMap = IntIntMaps.immutable.empty();
+
+        MutableObjectIntMap<String> intObject = ObjectIntMaps.mutable.empty();
+        intObject.addToValue("price", 2);
+    }
+
+    private static void troveMap() {
+
+        double[] doubles = new double[] {1.2, 4.5, 0.3};
+        int[] ints = new int[] {1, 4, 0};
+
+        TDoubleIntMap doubleIntMap = new TDoubleIntHashMap(doubles, ints);
+
+        doubleIntMap.adjustValue(1.2, 1);
+        doubleIntMap.adjustValue(4.5, 4);
+        doubleIntMap.adjustValue(0.3, 0);
+
+        System.out.println(doubleIntMap);
+    }
+}