diff --git a/em-oop/src/Circle.java b/em-oop/src/Circle.java
new file mode 100644
index 0000000..9097f3b
--- /dev/null
+++ b/em-oop/src/Circle.java
@@ -0,0 +1,25 @@
+
+public class Circle extends Shape {
+
+	//Shapeクラスを継承
+
+	//フィールド作成
+	private double radius;
+
+	//コンストラクタ作成
+	public Circle(double radius) {
+		super("円");
+		this.radius = radius;
+	}
+
+	//メソッド作成
+	public double area() {
+		return Math.PI * radius * radius;
+	}
+
+	public void showInfo() {
+		super.showInfo();
+		System.out.println("(半径:" + this.radius + ")");
+	}
+
+}
diff --git a/em-oop/src/Day3Check1.java b/em-oop/src/Day3Check1.java
new file mode 100644
index 0000000..814f6a7
--- /dev/null
+++ b/em-oop/src/Day3Check1.java
@@ -0,0 +1,15 @@
+
+public class Day3Check1 {
+
+	public static void main(String[] args) {
+	
+		//インスタンス作成
+		Circle c = new Circle(2);
+		
+		//メソッド呼び出し
+		c.showInfo();
+		
+
+	}
+
+}
diff --git a/em-oop/src/Shape.java b/em-oop/src/Shape.java
new file mode 100644
index 0000000..29a87d1
--- /dev/null
+++ b/em-oop/src/Shape.java
@@ -0,0 +1,22 @@
+
+public class Shape {
+
+	//フィールド作成
+	private String name;
+
+	//コンストラクタ作成
+	public Shape(String name) {
+	}
+
+	//メソッド作成
+	double area() {
+		return 0.0;
+	}
+
+	//メソッド作成
+	void showInfo() {
+		//出力
+		System.out.println(this.name + "の面積は" + this.area() + "です");
+	}
+
+}