diff --git a/em-oop/.gitignore b/em-oop/.gitignore
index ae3c172..ea03d78 100644
--- a/em-oop/.gitignore
+++ b/em-oop/.gitignore
@@ -1 +1,2 @@
 /bin/
+/.metadata/
diff --git a/em-oop/src/BasicCheck2.java b/em-oop/src/BasicCheck2.java
index d85b755..93e4718 100644
--- a/em-oop/src/BasicCheck2.java
+++ b/em-oop/src/BasicCheck2.java
@@ -4,9 +4,18 @@ public class BasicCheck2 {
 		//変数宣言
 		Student student = new Student();
 		//代入
-		student.studentId = 1;
-		student.name = "鈴木一郎";
-		student.printProfile();
+		//student.studentId = 1;
+		//student.name = "鈴木一郎";
+		//student.printProfile();
 		
+		Student student1 = new Student(1,"鈴木一郎");
+		Student student2 = new Student(2,"田中花子");
+		Student student3 = new Student(3,"佐藤次郎");
+		
+		student1.printProfile();
+		student2.printProfile();
+		student3.printProfile();
+		
+		//Student.getStudentCount();
 	}
 }
diff --git a/em-oop/src/Circle.java b/em-oop/src/Circle.java
new file mode 100644
index 0000000..40fdf5a
--- /dev/null
+++ b/em-oop/src/Circle.java
@@ -0,0 +1,21 @@
+
+public class Circle extends Sharpe {
+	//フィールド
+	private double radius;
+	//コンストラクタ
+	public Circle(double radius) {
+		super("円");
+		this.radius = radius;
+	}
+	//メソッド1
+	@Override
+	public double area() {
+		return Math.PI * radius * radius;
+}
+	//メソッド2
+	@Override
+	public void showInfo() {
+		super.showInfo();
+		System.out.println("半径:" + this.radius + "");
+	}
+}
\ No newline at end of file
diff --git a/em-oop/src/Day3Check1.java b/em-oop/src/Day3Check1.java
new file mode 100644
index 0000000..d722262
--- /dev/null
+++ b/em-oop/src/Day3Check1.java
@@ -0,0 +1,10 @@
+
+public class Day3Check1 {
+
+	public static void main(String[] args) {
+		//インスタンス
+		 Circle circle = new Circle(2.0); 
+		 circle.showInfo();
+	}
+
+}
diff --git a/em-oop/src/Item.java b/em-oop/src/Item.java
index 4af6ff7..14b3f70 100644
--- a/em-oop/src/Item.java
+++ b/em-oop/src/Item.java
@@ -9,6 +9,8 @@ public class Item {
 	void sell(int amount) {
 		this.setStock(this.getStock() - amount);
 	}
+	
+	//ゲッター、セッター設定
 
 	public String getName() {
 		return name;
diff --git a/em-oop/src/Sharpe.java b/em-oop/src/Sharpe.java
new file mode 100644
index 0000000..bb15334
--- /dev/null
+++ b/em-oop/src/Sharpe.java
@@ -0,0 +1,16 @@
+
+public class Sharpe {
+	//フィールド宣言
+	private String name;
+	//コンストラクタ
+	public Sharpe(String name) {
+	}
+	//メソッド1
+	double area() {
+		return  0.0;
+	}
+	//メソッド2
+	void showInfo() {
+		System.out.println(this.name + "の面積は" + this.area() + "です");
+	}
+}
diff --git a/em-oop/src/Student.java b/em-oop/src/Student.java
index 0876ea7..f59081b 100644
--- a/em-oop/src/Student.java
+++ b/em-oop/src/Student.java
@@ -1,13 +1,25 @@
 
 public class Student {
 	//フィールド宣言
-			int studentId;
-			String name;
-	
+	int studentId;
+	String name;
+	//フィールド追加
+	static int studentCount = 0;
+
 	//メソッド宣言
 	void printProfile() {
-			System.out.println("学籍番号:" + this.studentId + " 名前:" + this.name);	
-		
+		System.out.println("学籍番号:" + this.studentId + " 名前:" + this.name);
 	}
-}
 
+	//コントラクタ追加
+	public Student(int studentId, String name) {
+		this.studentId = studentId;
+		this.name = name;
+	}
+	//コントラクタ追加
+	public static int studentCount() {
+		return studentCount;
+
+	}
+
+}