diff --git a/.DS_Store b/.DS_Store
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index 0000000..829f0a2
--- /dev/null
+++ b/.DS_Store
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diff --git a/.vscode/settings.json b/.vscode/settings.json
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index 0000000..96ee3d1
--- /dev/null
+++ b/.vscode/settings.json
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+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin"
+}
diff --git a/README.md b/README.md
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+++ b/README.md
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+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).
diff --git a/bin/App.class b/bin/App.class
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index 0000000..aa90a01
--- /dev/null
+++ b/bin/App.class
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diff --git a/bin/Onigiri.class b/bin/Onigiri.class
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index 0000000..b4ab8ae
--- /dev/null
+++ b/bin/Onigiri.class
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diff --git a/bin/YakiOnigiri.class b/bin/YakiOnigiri.class
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index 0000000..8c3d670
--- /dev/null
+++ b/bin/YakiOnigiri.class
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diff --git a/bin/pack/InPackage.class b/bin/pack/InPackage.class
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index 0000000..fdbd8fa
--- /dev/null
+++ b/bin/pack/InPackage.class
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diff --git a/src/App.java b/src/App.java
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index 0000000..30238ce
--- /dev/null
+++ b/src/App.java
@@ -0,0 +1,32 @@
+//import javax.swing.JOptionPane;
+
+public class App {
+    public static void main(String[] args) throws Exception {
+        javax.swing.JOptionPane.showMessageDialog(null, "message", "title", javax.swing.JOptionPane.INFORMATION_MESSAGE);
+        System.out.println("Hello, World!");
+        // 基本のおにぎりをつくる
+        // コンストラクタを呼び出し、インスタンスを生成
+        Onigiri siomusubi = new Onigiri();
+        System.out.println("siomusubi = " + siomusubi.toString());
+
+        Onigiri ume = new Onigiri("梅", true);
+        System.out.println("ume = " + ume.toString());
+
+        Onigiri marusake = new Onigiri("鮭", 0);
+        System.out.println("marusake = " + marusake.toString());
+
+        Onigiri mentai = new Onigiri("明太子", true, 1);
+        System.out.println("mentai = " + mentai.toString());
+
+        Onigiri okaka = new Onigiri("おかか", false, 3);
+        System.out.println("okaka = " + okaka.toString());
+
+        System.out.println(Onigiri.count + "個のおにぎりをつくりました");
+        for(Onigiri x : Onigiri.all){
+            System.out.println(x.toString());
+        }
+
+        System.out.println( new YakiOnigiri().toString() );
+
+    }
+}
diff --git a/src/Onigiri.java b/src/Onigiri.java
new file mode 100644
index 0000000..3faedbe
--- /dev/null
+++ b/src/Onigiri.java
@@ -0,0 +1,76 @@
+import java.util.ArrayList;
+
+public class Onigiri {
+    static int count = 0; //つくったおにぎりの数をカウントする
+    static void printCount(){
+        System.out.println(count + "個のおにぎりをつくりました");
+    }
+    static ArrayList<Onigiri> all;
+    static {
+        all = new ArrayList<Onigiri>();
+    }
+
+    public static void main(String[] args) {
+        Onigiri ume = new Onigiri("梅", true);
+        System.out.println("ume = " + ume.toString());
+        System.out.println(count + "個のおにぎりをつくりました");
+
+        System.out.println( new YakiOnigiri().toString() );
+    }
+
+    // フィールド/メンバ＝データの詳細
+    String gu; /* おにぎりの具名 */
+    boolean withNori; /* 海苔がついているか？ true / false */
+    int shape; /* 0:丸, 1:俵型, 3:三角形 */
+
+    // コンストラクタ＝データ製造機
+    public Onigiri() {
+        gu = "無し（塩むすび）";
+        withNori = false;
+        shape = 3;
+        Onigiri.count++;
+        Onigiri.all.add(this);
+    }
+
+    public Onigiri(String _gu) {
+        this();
+        gu = _gu;
+    }
+
+    public Onigiri(String gu, int shape) {
+        this(gu);
+        this.shape = shape;
+    }
+
+    public Onigiri(String gu, boolean wnori) {
+        this(gu);
+        withNori = wnori;
+    }
+
+    public Onigiri(String gu, boolean wnori, int shape) {
+        this(gu, wnori);
+        this.shape = shape;
+    }
+
+    // メソッドの役割：(1) データの修正・更新をする (2) データに関する情報を出力 (3) データに関する処理
+    public void setWithNori(boolean wnori) {
+        withNori = wnori;
+    }
+
+    public String toString() {
+        String str = "具は " + gu + " で、";
+        switch (shape) {
+            case 0:
+                str = str + "丸型で、";
+                break;
+            case 1:
+                str = str + "俵型で、";
+                break;
+            case 3:
+                str = str + "三角形で、";
+                break;
+        }
+        str = str + (withNori ? "海苔付き" : "海苔なし");
+        return str;
+    }
+}
diff --git a/src/YakiOnigiri.java b/src/YakiOnigiri.java
new file mode 100644
index 0000000..6ade19a
--- /dev/null
+++ b/src/YakiOnigiri.java
@@ -0,0 +1,13 @@
+public class YakiOnigiri extends Onigiri {
+    boolean koge = true;
+
+    public YakiOnigiri() {
+        super();// 親クラスのコンストラクタを呼び出す
+        // new Onigiri()
+    }
+
+    public String toString() {
+        String mes = super.toString();
+        return mes + "こげは " + koge;
+    }
+}
diff --git a/src/pack/InPackage.java b/src/pack/InPackage.java
new file mode 100644
index 0000000..89effb1
--- /dev/null
+++ b/src/pack/InPackage.java
@@ -0,0 +1,5 @@
+package pack;
+
+public class InPackage {
+    
+}