Add no enum map example too

core-java/src/main/java/com/geekyhacker/core/NoEnumMapExample.java

@@ -0,0 +1,27 @@
+package com.geekyhacker.core;
+
+import java.time.DayOfWeek;
+import java.util.HashMap;
+import java.util.Map;
+
+public class NoEnumMapExample {
+  private static final Map<String, String> germanDayOfWeeks = new HashMap<>();
+
+  static {
+    germanDayOfWeeks.put(DayOfWeek.MONDAY.name(), "Montag");
+    germanDayOfWeeks.put(DayOfWeek.TUESDAY.name(), "Dienstag");
+    germanDayOfWeeks.put(DayOfWeek.WEDNESDAY.name(), "Mittwoch");
+    germanDayOfWeeks.put(DayOfWeek.THURSDAY.name(), "Donnerstag");
+    germanDayOfWeeks.put(DayOfWeek.FRIDAY.name(), "Freitag");
+    germanDayOfWeeks.put(DayOfWeek.SATURDAY.name(), "Samstag");
+    germanDayOfWeeks.put(DayOfWeek.SUNDAY.name(), "Sonntag");
+  }
+
+  private NoEnumMapExample() {
+
+  }
+
+  public static String getCorrespondingGermanDayOfWeek(DayOfWeek englishDayOfWeek) {
+    return germanDayOfWeeks.get(englishDayOfWeek.name());
+  }
+}

core-java/src/test/java/com/geekyhacker/core/NoEnumMapExampleTest.java

@@ -0,0 +1,20 @@
+package com.geekyhacker.core;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import java.time.DayOfWeek;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class NoEnumMapExampleTest {
+
+  @ParameterizedTest
+  @CsvSource(value = {"MONDAY,Montag", "TUESDAY,Dienstag", "WEDNESDAY,Mittwoch",
+      "THURSDAY,Donnerstag", "FRIDAY,Freitag", "SATURDAY,Samstag", "SUNDAY,Sonntag"})
+  void shouldRetrieveCorrespondingDayOfWeekInGerman(DayOfWeek dayOfWeek, String expectedGermanDayOfWeek) {
+    var germanDayOfWeek = EnumMapExample.getCorrespondingGermanDayOfWeek(dayOfWeek);
+    assertEquals(expectedGermanDayOfWeek, germanDayOfWeek);
+  }
+
+}