diff --git a/app/src/main/java/com/example/nemophila/MyPageActivity.java b/app/src/main/java/com/example/nemophila/MyPageActivity.java
index 131f618..f90011a 100644
--- a/app/src/main/java/com/example/nemophila/MyPageActivity.java
+++ b/app/src/main/java/com/example/nemophila/MyPageActivity.java
@@ -1,5 +1,6 @@
 package com.example.nemophila;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProvider;
@@ -99,11 +100,11 @@
             }
         });
 
-        /* ここからあんまわかっていない */
         RecyclerView rv = findViewById(R.id.postsList);
         LinearLayoutManager llm = new LinearLayoutManager(this);
         List<MyPageActDataModel> myPageActDataset = new ArrayList<>();
         MyPageActAdapter adapter = new MyPageActAdapter(myPageActDataset) {
+            // 「（投稿）削除」ボタンを押した後、「Yes」を押すと対象の投稿を削除する
             @Override
             void onDeleteButtonClick(View view, int position, MyPageActDataModel dataModel) {
                 new AlertDialog.Builder(MyPageActivity.this)
@@ -127,6 +128,7 @@
         rv.setLayoutManager(llm);
         rv.setAdapter(adapter);
 
+        // getAccountPostsLiveDataとの通信により今までにユーザーがしている投稿を表示する
         accountViewModel.getAccountPosts(uid);
         accountViewModel.getAccountPostsLiveData().observe(this, new Observer <Collection<Post>>() {
             @Override
@@ -169,7 +171,7 @@
         public MyPageActAdapter(List<MyPageActDataModel> list) { this.list = list; }
 
         @Override
-        public MyPageActViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        public MyPageActViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
             View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_my_page_activity_posts, parent,false);
             MyPageActViewHolder vh = new MyPageActViewHolder(inflate);
 
@@ -185,7 +187,7 @@
         }
 
         @Override
-        public void onBindViewHolder(MyPageActViewHolder holder, int position) {
+        public void onBindViewHolder(@NonNull MyPageActViewHolder holder, int position) {
             holder.dateView.setText(list.get(position).getDate());
             holder.rateView.setText(list.get(position).getRate());
             holder.genreView.setText(list.get(position).getGenre());
@@ -206,7 +208,7 @@
         public TextView commentView;
         public ImageButton deleteButton;
 
-        public MyPageActViewHolder(View view) {
+        public MyPageActViewHolder(@NonNull View view) {
             super(view);
             dateView = (TextView) view.findViewById(R.id.date);
             rateView = (TextView) view.findViewById(R.id.rate);
@@ -217,7 +219,7 @@
     }
 
     // DataModel
-    public class MyPageActDataModel {
+    public static class MyPageActDataModel {
         private String date;
         private String rate;
         private String genre;