diff --git a/em-oop/src/Circle.java b/em-oop/src/Circle.java
new file mode 100644
index 0000000..b5f533b
--- /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() {
+		double num;
+		num = Math.PI * radius * radius;
+		return num;
+	}
+	@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..251950e
--- /dev/null
+++ b/em-oop/src/Day3Check1.java
@@ -0,0 +1,9 @@
+
+public class Day3Check1 {
+
+	public static void main(String[] args) {
+		Circle circle = new Circle(2);
+		circle.showInfo();
+	}
+
+}
diff --git a/em-oop/src/Shape.java b/em-oop/src/Shape.java
new file mode 100644
index 0000000..baf0a9c
--- /dev/null
+++ b/em-oop/src/Shape.java
@@ -0,0 +1,14 @@
+
+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");
+	}
+}