1段階目（継承とsuperでシンプルな図形クラスを作ろう）

em-oop/src/Circle.java

@@ -0,0 +1,22 @@
+
+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 + ")");
+	}
+
+}

em-oop/src/Day3Check1.java

@@ -0,0 +1,8 @@
+
+public class Day3Check1 {
+
+	public static void main(String[] args) {
+		Circle circle = new Circle(2);
+		circle.showInfo();
+	}
+}

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");
+	}
+}