diff --git a/.gitignore b/.gitignore
index 9154f4c..bee9d6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@
 hs_err_pid*
 replay_pid*
 
+/build/
diff --git a/src/main/java/BaseTicket.java b/src/main/java/BaseTicket.java
new file mode 100644
index 0000000..2fb37ed
--- /dev/null
+++ b/src/main/java/BaseTicket.java
@@ -0,0 +1,63 @@
+
+public class BaseTicket {
+
+	// カプセル化
+	private String eventName;
+	private String ticketId;
+	private String eventData;
+
+	// 初期化
+	public BaseTicket(String ticketId, String eventName, String eventData) {
+		this.eventName = eventName;
+		this.ticketId = ticketId;
+		this.eventData = eventData;
+	}
+
+	public String getEventName() {
+		return eventName;
+	}
+
+	public void setEventName(String eventName) {
+		this.eventName = eventName;
+		// Nullチェックと空白チェック
+		if (eventName == null || eventName.strip().isEmpty()) {
+			System.out.println("イベント名が空のため設定できませんでした");
+			return;
+		}
+	}
+
+	public String getTicketId() {
+		return ticketId;
+	}
+
+	public void setTicketId(String ticketId) {
+		this.ticketId = ticketId;
+		if (ticketId == null || ticketId.strip().isEmpty()) {
+			System.out.println("チケットIDが空のため設定できませんでした");
+			return;
+		}
+	}
+
+	public String getEventData() {
+		return eventData;
+	}
+
+	public void setEventData(String eventData) {
+		this.eventData = eventData;
+		if (eventData == null || eventData.strip().isEmpty()) {
+			System.out.println("開催日が空のため設定できませんでした");
+			return;
+		}
+	}
+
+	public void showBaseInfo() {
+		System.out.println("チケットID：" + ticketId);
+		System.out.println("イベント名：" + eventName);
+		System.out.println("開催日：" + eventData);
+	}
+
+	public void showInfo() {
+
+	}
+
+}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
new file mode 100644
index 0000000..3b4734f
--- /dev/null
+++ b/src/main/java/Main.java
@@ -0,0 +1,33 @@
+
+public class Main {
+	public static void main(String[] args) {
+		// インスタンス化
+		TicketManager manager = new TicketManager();
+
+		manager.addTicket(new Ticket("001", "ROCK IN JAPAN 2026", "2026-09-12", 16000));
+		manager.addTicket(new Ticket("002", "ROCK IN JAPAN 2026", "2026-09-13", 16000));
+		manager.addTicket(new Ticket("003", "ROCK IN JAPAN 2026", "2026-09-19", 16000));
+		manager.addTicket(new Ticket("004", "ROCK IN JAPAN 2026", "2026-09-20", 16000));
+		manager.addTicket(new Ticket("005", "ROCK IN JAPAN 2026", "2026-09-21", 16000));
+
+		manager.showAllTockets();
+		System.out.println();
+
+		System.out.println("=== 日付ごとの予約仕分け結果 ===");
+		System.out.println("2026-09-12 (1日目) の予約件数：" + manager.GetCountByDate("2026-09-12") + "件");
+		System.out.println("2026-09-13 (2日目) の予約件数：" + manager.GetCountByDate("2026-09-13") + "件");
+		System.out.println("2026-09-19 (3日目) の予約件数：" + manager.GetCountByDate("2026-09-19") + "件");
+		System.out.println("2026-09-20 (4日目) の予約件数：" + manager.GetCountByDate("2026-09-20") + "件");
+		System.out.println("2026-09-21 (5日目) の予約件数：" + manager.GetCountByDate("2026-09-21") + "件");
+
+		System.out.println();
+		System.out.println("現在の予約件数合計：" + Ticket.getReservedCount() + "件");
+		System.out.println();
+		
+		
+		// テスト
+		System.out.println("テスト");
+		Ticket sample = new Ticket("T999", "テストイベント", "2026-09-22", 16000);
+		sample.setEventName("");
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/Ticket.java b/src/main/java/Ticket.java
new file mode 100644
index 0000000..c16d6fd
--- /dev/null
+++ b/src/main/java/Ticket.java
@@ -0,0 +1,32 @@
+
+// 継承
+public class Ticket extends BaseTicket {
+	private int price;
+	// Ticketクラスで共有する変数
+	private static int reservedCount = 0;
+
+	public static int getReservedCount() {
+		return reservedCount;
+	}
+
+	public Ticket(String ticketId, String eventName, String eventData, int price) {
+		// BaseTicketのコンストラクタを動かすため
+		super(ticketId, eventName, eventData);
+		this.price = price;
+		// チケットが追加されるたびに予約件数をカウントアップ
+		reservedCount++;
+	}
+
+	public int getPrice() {
+		return price;
+	}
+
+	// BaseTicketのshowInfoに上書き
+	@Override
+	public void showInfo() {
+		showBaseInfo();
+		System.out.println("価格：" + price + "円");
+
+	}
+
+}
diff --git a/src/main/java/TicketManager.java b/src/main/java/TicketManager.java
new file mode 100644
index 0000000..27d0e50
--- /dev/null
+++ b/src/main/java/TicketManager.java
@@ -0,0 +1,29 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class TicketManager {
+	// 可変長の配列作成
+	private List<BaseTicket> tickets = new ArrayList<>();
+
+	// ポリモーフィズム
+	public void addTicket(BaseTicket ticket) {
+		tickets.add(ticket);
+	}
+
+	public void showAllTockets() {
+		// for-each文
+		for (BaseTicket ticket : tickets) {
+			ticket.showInfo();
+		}
+	}
+	// 日付ごとの仕分け
+	public int GetCountByDate(String targetDate) {
+		int count = 0;
+		for (BaseTicket ticket : tickets) {
+			if (ticket.getEventData().equals(targetDate)) {
+				count++;
+			}
+		}
+		return count;
+	}
+}