diff --git a/em-oop/src/BasicCheck1.java b/em-oop/src/BasicCheck1.java
index 0bf11e4..d4b6a6a 100644
--- a/em-oop/src/BasicCheck1.java
+++ b/em-oop/src/BasicCheck1.java
@@ -2,15 +2,22 @@
 public class BasicCheck1 {
 
 	public static void main(String[] args) {
-		Book book = new Book();
+		//Book book = new Book();
 		
-		book.title = "吾輩は猫である";
-		book.author = "夏目漱石";
-		book.price = 800;
+		//book.title = "吾輩は猫である";
+		//book.author = "夏目漱石";
+		//book.price = 800;
+		
+		//System.out.println(book.title);
+		//System.out.println(book.author);
+		//System.out.println(book.price);
+		
+		//引数なし
+		Book book1 = new Book();
+		
+		//引数あり
+		Book book2 = new Book("銀河鉄道の夜", "宮沢賢治", 500);
 		
-		System.out.println(book.title);
-		System.out.println(book.author);
-		System.out.println(book.price);
 	}
 
 }
diff --git a/em-oop/src/Book.java b/em-oop/src/Book.java
index 418f4a3..7a57ee9 100644
--- a/em-oop/src/Book.java
+++ b/em-oop/src/Book.java
@@ -3,4 +3,19 @@ public class Book {
 	String title;
 	String author;
 	int price;
+	
+	//コンストラクタ生成
+	public Book() {
+		System.out.println( "タイトル未設定");
+		System.out.println( "著者未設定"); 
+		System.out.println( "0"); 
+	}
+	//3つの引数を持つコンストラクタ生成
+	public Book(String title, String author, int price) {
+		System.out.println(this.title = title);
+		System.out.println(this.author = author);
+		System.out.println(this.price = price);
+		
+	}
+	
 }