diff --git a/SingletonTest.java b/SingletonTest.java
new file mode 100644
index 0000000..d925834
--- /dev/null
+++ b/SingletonTest.java
@@ -0,0 +1,50 @@
+import java.util.Calendar;
+import java.util.Date;
+
+public class SingletonTest {
+
+	public static void main(String[] args) throws InterruptedException {
+        // staticメソッドで「設定」を作成
+		MySetting ms = MySetting.getInstance();
+		int object_id = ms.hashCode(); // hashCode()は、オブジェクト固有のIDを返す
+		System.out.println(ms.getCreated().toString());
+		// Thread.sleep(1200); // VSCodeで動作チェックするときに使うとよい
+		MySetting ms2 = MySetting.getInstance();
+		System.out.println(ms2.getCreated().toString());
+		System.out.println(ms2.getLastAccessed().toString());
+
+		int object_id2 = ms2.hashCode();
+		if (object_id == object_id2) {
+			System.out.println("Object is same.");
+		} else {
+			System.out.println("Object is different.");
+		}
+		if (ms.getCreated() == ms2.getCreated()) {
+			System.out.println("CreatedDate is also same.");
+		} else {
+			System.out.println("CreatedDate is different.");
+		}
+	}
+}
+
+class MySetting {
+	private static MySetting instance = null ;  // 初期状態はオブジェクトなし。
+	private MySetting(){  // 【重要】コンストラクタは private にしておく（自由に作らせない）
+		created = Calendar.getInstance().getTime(); // 作成日時
+	}
+	private Date created;
+	private Date lastAccessed;
+	public static MySetting getInstance(){   // インスタンスが必要なら、このメソッドを呼び出す
+// TODO: このあたりの、記述を追加・変更する必要がある
+		instance = new MySetting();
+
+		instance.lastAccessed = Calendar.getInstance().getTime();
+		return instance;
+	}
+	public Date getCreated(){
+		return created;
+	}
+	public Date getLastAccessed(){
+		return lastAccessed;
+	}
+}
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