diff --git a/em-oop/src/Circle.java b/em-oop/src/Circle.java
new file mode 100644
index 0000000..54f49d1
--- /dev/null
+++ b/em-oop/src/Circle.java
@@ -0,0 +1,20 @@
+
+public class Circle extends Shape {
+	private double radius;
+
+	public Circle(double radius) {
+		super("円");
+		this.radius = radius;
+	}
+
+	@Override
+	public double area() {
+		return Math.PI * radius * radius;
+	}
+
+	@Override
+	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..dc0c8fb
--- /dev/null
+++ b/em-oop/src/Day3Check1.java
@@ -0,0 +1,8 @@
+
+public class Day3Check1 {
+	public static void main(String[] args) {
+		Circle radius = new Circle(2);
+		radius.showInfo();
+	}
+
+}
diff --git a/em-oop/src/Shape.java b/em-oop/src/Shape.java
new file mode 100644
index 0000000..a1fc549
--- /dev/null
+++ b/em-oop/src/Shape.java
@@ -0,0 +1,16 @@
+
+public class Shape {
+	private String name;
+	public Shape(String name) {
+		this.name = name;
+	}
+	
+	public double area() {
+		return 0.0;
+	}
+	public void showInfo() {
+		System.out.println(this.name + "の面積は" + this.area() + "です");
+	}
+	
+	
+}