diff --git a/app/build.gradle b/app/build.gradle
index 14b2299..b424cec 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,6 +21,10 @@
         }
     }
     buildToolsVersion '27.0.3'
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {
diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
index cb3a0b9..623c51a 100644
--- a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTPad.java
@@ -39,12 +39,15 @@
         addListener(new SamplePadListener());
     }
 
+    // TODO; 見た目の調整
     @Override
     public void onDraw(Canvas canvas) {
         // super.onDraw(canvas);
         Paint paint = this.createRedPaint();
         canvas.drawCircle(getSize().x / 2, getSize().x / 2, getSize().x / 2, paint);
 
+        // TODO: あとでいい感じになるように修正
+        // このクラス内の他の部分も同様
         paint.setColor(Color.BLUE);
         if (circlePos == null) {
             circlePos = new Point(getSize().x / 2, getSize().y / 2);
@@ -82,7 +85,7 @@
 
         touchInfo = event;
         PadEvent padEvent = new PadEvent(event, fixLen, angle);
-        PadSubject.getInstance().pushListeners(padEvent);
+        PadSubject.getInstance().notifyListeners(padEvent);
 
         if (event.getAction() == MotionEvent.ACTION_UP) {
             circlePos.x = getSize().x / 2;
diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/PadSubject.java b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/PadSubject.java
index f08c156..ece74d6 100644
--- a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/PadSubject.java
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/PadSubject.java
@@ -16,7 +16,8 @@
         super.addListener(listener);
     }
 
-    public void pushListeners(PadEvent e) {
-        notifyListeners(e);
+    @Override
+    public void notifyListeners(PadEvent e) {
+        super.notifyListeners(e);
     }
 }