BAEL-5785 Map.of() vs Map.ofEntries() test (#13064)

* BAEL-5785 Map.of() vs Map.ofEntries() test

* Update pom.xml

* Update pom.xml

* Add immutable test case

* Update map naming

core-java-modules/core-java-collections-maps-5/pom.xml

@@ -5,6 +5,18 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>core-java-collections-maps-5</artifactId>
     <version>0.1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>9</source>
+                    <target>9</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <name>core-java-collections-maps-5</name>
     <packaging>jar</packaging>
 

core-java-modules/core-java-collections-maps-5/src/test/java/com/baeldung/map/mapofvsmapofentries/MapOfEntriesVsMapOfUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.map.mapofvsmapofentries;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class MapOfEntriesVsMapOfUnitTest {
+
+    @Test
+    void mapOf() {
+        // Use Map.of() to create an empty immutable map
+        Map<Long, String> map = Map.of();
+        assertNotNull(map);
+
+        // Use Map.of() to create an immutable map with one entry
+        Map<Long, String> mapWithEntry = Map.of(1L, "value1");
+        assertNotNull(mapWithEntry);
+        assertThat(mapWithEntry.size()).isEqualTo(1);
+        assertThat(mapWithEntry.get(1L)).isEqualTo("value1");
+        
+        // Test if map is immutable
+        try {
+            mapWithEntry.put(2L, "value2");
+        } catch (UnsupportedOperationException e) {
+            assertThat(e).isInstanceOf(UnsupportedOperationException.class);
+        }
+    }
+
+    @Test
+    void mapOfEntries() {
+        // Use Map.ofEntries() to create an empty immutable map
+        Map<Long, String> map = Map.ofEntries();
+        assertNotNull(map);
+
+        // Use Map.ofEntries() to create an immutable map with two entries.
+        Map<Long, String> longUserMap = Map.ofEntries(Map.entry(1L, "User A"), Map.entry(2L, "User B"));
+        assertNotNull(longUserMap);
+        assertThat(longUserMap.size()).isEqualTo(2);
+        assertThat(longUserMap.get(1L)).isEqualTo("User A");
+        assertThat(longUserMap.get(2L)).isEqualTo("User B");
+                
+        // Test if map is immutable
+        try {
+            longUserMap.put(3L, "User C");
+        } catch (UnsupportedOperationException e) {
+            assertThat(e).isInstanceOf(UnsupportedOperationException.class);
+        }
+    }
+}

core-java-modules/pom.xml

@@ -41,7 +41,6 @@
         <module>core-java-collections-maps</module>
         <module>core-java-collections-maps-2</module>
         <module>core-java-collections-maps-3</module>
-        <module>core-java-collections-maps-5</module>
         <module>core-java-concurrency-2</module>
         <module>core-java-concurrency-advanced</module>
         <module>core-java-concurrency-advanced-2</module>

pom.xml

@@ -1129,6 +1129,7 @@
                  <module>core-java-modules/core-java-collections-set</module>
                  <module>core-java-modules/core-java-collections-list-4</module>
                  <module>core-java-modules/core-java-collections-maps-4</module>
+                 <module>core-java-modules/core-java-collections-maps-5</module>
                  <module>core-java-modules/core-java-concurrency-simple</module>
                  <module>core-java-modules/core-java-date-operations-1</module>
                  <module>core-java-modules/core-java-datetime-conversion</module>