diff --git a/java-collections-maps-3/src/main/java/com/baeldung/map/invert/InvertHashMapExample.java b/java-collections-maps-3/src/main/java/com/baeldung/map/invert/InvertHashMapExample.java
deleted file mode 100644
index a203fd17c4..0000000000
--- a/java-collections-maps-3/src/main/java/com/baeldung/map/invert/InvertHashMapExample.java
+++ /dev/null
@@ -1,59 +0,0 @@
-package com.baeldung.map.invert;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.stream.Collectors;
-
-public class InvertHashMapExample {
-
-    public static void main(String[] args) {
-
-        Map<String, Integer> map = new HashMap<>();
-        map.put("first", 1);
-        map.put("second", 2);
-        System.out.println(map);
-
-        invertMapUsingForLoop(map);
-        invertMapUsingStreams(map);
-        invertMapUsingMapper(map);
-
-        map.put("two", 2);
-        invertMapUsingGroupingBy(map);
-    }
-
-    public static <V, K> Map<V, K> invertMapUsingForLoop(Map<K, V> map) {
-        Map<V, K> inversedMap = new HashMap<V, K>();
-        for (Entry<K, V> entry : map.entrySet()) {
-            inversedMap.put(entry.getValue(), entry.getKey());
-        }
-        System.out.println(inversedMap);
-        return inversedMap;
-    }
-
-    public static <V, K> Map<V, K> invertMapUsingStreams(Map<K, V> map) {
-        Map<V, K> inversedMap = map.entrySet()
-            .stream()
-            .collect(Collectors.toMap(Entry::getValue, Entry::getKey));
-        System.out.println(inversedMap);
-        return inversedMap;
-    }
-
-    public static <K, V> Map<V, K> invertMapUsingMapper(Map<K, V> sourceMap) {
-        Map<V, K> inversedMap = sourceMap.entrySet()
-            .stream()
-            .collect(Collectors.toMap(Entry::getValue, Entry::getKey, (oldValue, newValue) -> oldValue));
-        System.out.println(inversedMap);
-        return inversedMap;
-    }
-
-    public static <V, K> Map<V, List<K>> invertMapUsingGroupingBy(Map<K, V> map) {
-        Map<V, List<K>> inversedMap = map.entrySet()
-            .stream()
-            .collect(Collectors.groupingBy(Map.Entry::getValue, Collectors.mapping(Map.Entry::getKey, Collectors.toList())));
-        System.out.println(inversedMap);
-        return inversedMap;
-    }
-
-}
diff --git a/java-collections-maps-3/src/test/java/com/baeldung/map/invert/InvertHashMapExampleTest.java b/java-collections-maps-3/src/test/java/com/baeldung/map/invert/InvertHashMapExampleTest.java
deleted file mode 100644
index aecfbfe675..0000000000
--- a/java-collections-maps-3/src/test/java/com/baeldung/map/invert/InvertHashMapExampleTest.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.baeldung.map.invert;
-
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.TestInstance;
-
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-public class InvertHashMapExampleTest {
-
-    Map<String, Integer> sourceMap;
-
-    @BeforeAll
-    void setup() {
-        sourceMap = new HashMap<>();
-        sourceMap.put("Sunday", 0);
-        sourceMap.put("Monday", 1);
-    }
-
-    @Test
-    void test1_invertMapUsingForLoop() {
-        Map<Integer, String> inversedMap = InvertHashMapExample.invertMapUsingForLoop(sourceMap);
-        assertNotNull(inversedMap);
-        assertEquals(inversedMap.size(), 2);
-        assertEquals("Monday", inversedMap.get(1));
-    }
-
-    @Test
-    void test2_invertMapUsingStreams() {
-        Map<Integer, String> inversedMap = InvertHashMapExample.invertMapUsingStreams(sourceMap);
-        assertNotNull(inversedMap);
-        assertEquals(inversedMap.size(), 2);
-        assertEquals("Monday", inversedMap.get(1));
-    }
-
-    @Test
-    void test3_invertMapUsingMapper() {
-        Map<Integer, String> inversedMap = InvertHashMapExample.invertMapUsingMapper(sourceMap);
-        assertNotNull(inversedMap);
-        assertEquals(inversedMap.size(), 2);
-        assertEquals("Monday", inversedMap.get(1));
-    }
-
-    @Test
-    void test4_invertMapUsingGroupingBy() {
-        sourceMap.put("monday", 1);
-        Map<Integer, List<String>> inversedMap = InvertHashMapExample.invertMapUsingGroupingBy(sourceMap);
-        assertNotNull(inversedMap);
-        assertEquals(inversedMap.size(), 2);
-        assertTrue(inversedMap.get(1) instanceof List);
-    }
-
-}