diff --git a/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx01.java b/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx01.java
new file mode 100644
index 00000000..1eb16dca
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx01.java
@@ -0,0 +1,20 @@
+package org.example.ex11;
+
+import io.reactivex.rxjava3.core.Observable;
+import io.reactivex.rxjava3.core.Single;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+import java.util.List;
+
+/**
+ * 각각의 통지 데이터를 List로 변환해서 Single로 한번만 통지하는 예제
+ */
+public class ObservableToListEx01 {
+    public static void main(String[] args) {
+        Single<List<Integer>> single = Observable.just(1, 3, 5, 7, 9)
+                                                .toList();
+
+        single.subscribe(data -> Logger.log(LogType.ON_NEXT, data));
+    }
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx02.java b/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx02.java
new file mode 100644
index 00000000..ae4cf08b
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex11/ObservableToListEx02.java
@@ -0,0 +1,17 @@
+package org.example.ex11;
+
+import io.reactivex.rxjava3.core.Observable;
+import org.example.common.SampleData;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+/**
+ * 각각의 통지될 Car 객체를 List로 변환해서 Single로 한번만 통지하는 예제
+ */
+public class ObservableToListEx02 {
+    public static void main(String[] args) {
+        Observable.fromIterable(SampleData.carList)
+                .toList()
+                .subscribe(carList -> Logger.log(LogType.ON_NEXT, carList));
+    }
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample01.java b/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample01.java
new file mode 100644
index 00000000..7f2451dc
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample01.java
@@ -0,0 +1,21 @@
+package org.example.ex11;
+
+import io.reactivex.rxjava3.core.Observable;
+import io.reactivex.rxjava3.core.Single;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+import java.util.Map;
+
+/**
+ * 통지된 데이터에서 map의 키를 생성한 후, 각각의 키별로 원본 통지 데이터를 매핑해서 Map으로 반환하는 예제
+ */
+public class ObservableToMapExample01 {
+    public static void main(String[] args) {
+        Single<Map<String, String>> single =
+                Observable.just("a-Alpha", "b-Bravo", "c-Charlie", "e-Echo")
+                        .toMap(data -> data.split("-")[0]); // 반환값은 Map의 key가 된다.
+
+        single.subscribe(map -> Logger.log(LogType.ON_NEXT, map));
+    }
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample02.java b/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample02.java
new file mode 100644
index 00000000..43d5f87b
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex11/ObservableToMapExample02.java
@@ -0,0 +1,23 @@
+package org.example.ex11;
+
+import io.reactivex.rxjava3.core.Observable;
+import io.reactivex.rxjava3.core.Single;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+import java.util.Map;
+
+/**
+ * 원본 데이터를 변환한 값과 각각의 key를 매핑하여 Map으로 통지하는 예제
+ */
+public class ObservableToMapExample02 {
+    public static void main(String[] args) {
+        Single<Map<String, String>> single = Observable.just("a-Alpha", "b-Bravo", "c-Charlie", "e-Echo")
+                .toMap(
+                    data -> data.split("-")[0],
+                    data -> data.split("-")[1]
+                );
+
+        single.subscribe(map -> Logger.log(LogType.ON_NEXT, map));
+    }
+}
\ No newline at end of file