diff --git a/RxJava/practice/src/main/java/org/example/ex05/SingleCreateEx.java b/RxJava/practice/src/main/java/org/example/ex05/SingleCreateEx.java
new file mode 100644
index 00000000..1c656efc
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex05/SingleCreateEx.java
@@ -0,0 +1,40 @@
+package org.example.ex05;
+
+import io.reactivex.rxjava3.annotations.NonNull;
+import io.reactivex.rxjava3.core.Single;
+import io.reactivex.rxjava3.core.SingleEmitter;
+import io.reactivex.rxjava3.core.SingleObserver;
+import io.reactivex.rxjava3.core.SingleOnSubscribe;
+import io.reactivex.rxjava3.disposables.Disposable;
+import org.example.utils.DateUtil;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+public class SingleCreateEx {
+
+    public static void main(String[] args) {
+        Single<String> single = Single.create(new SingleOnSubscribe<String>() {
+            @Override
+            public void subscribe(@NonNull SingleEmitter<String> emitter) throws Throwable {
+                emitter.onSuccess(DateUtil.getNowDate());
+            }
+        });
+
+        single.subscribe(new SingleObserver<String>() {
+            @Override
+            public void onSubscribe(@NonNull Disposable d) {
+
+            }
+
+            @Override
+            public void onSuccess(@NonNull String s) {
+                Logger.log(LogType.ON_SUCCESS, "# 날짜시간: " + s);
+            }
+
+            @Override
+            public void onError(@NonNull Throwable e) {
+                Logger.log(LogType.ON_ERROR, e);
+            }
+        });
+    }
+}
diff --git a/RxJava/practice/src/main/java/org/example/ex05/SingleCreateLambdaEx.java b/RxJava/practice/src/main/java/org/example/ex05/SingleCreateLambdaEx.java
new file mode 100644
index 00000000..58030d98
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex05/SingleCreateLambdaEx.java
@@ -0,0 +1,18 @@
+package org.example.ex05;
+
+import io.reactivex.rxjava3.core.Single;
+import org.example.utils.DateUtil;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+public class SingleCreateLambdaEx {
+
+    public static void main(String[] args) {
+        Single<String> single = Single.create(emitter -> emitter.onSuccess(DateUtil.getNowDate()));
+
+        single.subscribe(
+                data -> Logger.log(LogType.ON_SUCCESS, "# 날짜시간: " + data),
+                error -> Logger.log(LogType.ON_ERROR, error)
+        );
+    }
+}
diff --git a/RxJava/practice/src/main/java/org/example/ex05/SingleJustEx.java b/RxJava/practice/src/main/java/org/example/ex05/SingleJustEx.java
new file mode 100644
index 00000000..6a558c9c
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/ex05/SingleJustEx.java
@@ -0,0 +1,17 @@
+package org.example.ex05;
+
+import io.reactivex.rxjava3.core.Single;
+import org.example.utils.DateUtil;
+import org.example.utils.LogType;
+import org.example.utils.Logger;
+
+public class SingleJustEx {
+
+    public static void main(String[] args) {
+        Single.just(DateUtil.getNowDate())
+                .subscribe(
+                        data -> Logger.log(LogType.ON_SUCCESS, "# 날짜시간: " + data),
+                        error -> Logger.log(LogType.ON_ERROR, error)
+                );
+    }
+}