diff --git a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
index bce174b..e5cdaab 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaMainActivity.java
@@ -20,5 +20,6 @@
         findViewById(R.id.fromarray_btn).setOnClickListener(view -> rxProcess.fromArray());
         findViewById(R.id.range_btn).setOnClickListener(view -> rxProcess.range());
         findViewById(R.id.interval_btn).setOnClickListener(view -> rxProcess.interval());
+        findViewById(R.id.timer_btn).setOnClickListener(view -> rxProcess.timer());
     }
 }
diff --git a/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java b/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
index af1465e..874bf94 100644
--- a/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
+++ b/app/src/main/java/org/ntlab/developrx/JavaRxProcess.java
@@ -154,4 +154,16 @@
         Flowable<Long> flowable = Flowable.interval(1000L, TimeUnit.MILLISECONDS).take(5);
         flowable.subscribe(data -> System.out.println(ThreadUtil.getCurrentThreadName() + ": " + System.currentTimeMillis() + ": " + "data = " + data));
     }
+
+    /**
+     * 指定時間後に0を通知する
+     */
+    public void timer() {
+        Flowable<Long> flowable = Flowable.timer(1000, TimeUnit.MILLISECONDS);
+        flowable.subscribe(
+                data -> System.out.println(ThreadUtil.getCurrentThreadName() + ": data = " + data),
+                error -> System.out.println("エラー = " + error),
+                () -> System.out.println("完了")
+        );
+    }
 }
diff --git a/app/src/main/res/layout/activity_main_java.xml b/app/src/main/res/layout/activity_main_java.xml
index bfe943e..bf7fc00 100644
--- a/app/src/main/res/layout/activity_main_java.xml
+++ b/app/src/main/res/layout/activity_main_java.xml
@@ -57,6 +57,14 @@
             android:text="interval"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/range_btn" />
+
+        <Button
+            android:id="@+id/timer_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="timer"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/interval_btn" />
     </android.support.constraint.ConstraintLayout>
 
 </ScrollView>