diff --git a/em-oop/src/Day3Check2.java b/em-oop/src/Day3Check2.java
new file mode 100644
index 0000000..206c9f8
--- /dev/null
+++ b/em-oop/src/Day3Check2.java
@@ -0,0 +1,11 @@
+
+public class Day3Check2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Rectangle r = new Rectangle(3, 4);
+		r.showInfo();
+		Greeting gre = new JapaneseGreeting();
+		System.out.println(gre.hello());
+	}
+}
diff --git a/em-oop/src/Greeting.java b/em-oop/src/Greeting.java
new file mode 100644
index 0000000..db0d8fc
--- /dev/null
+++ b/em-oop/src/Greeting.java
@@ -0,0 +1,5 @@
+
+public interface Greeting {
+	String hello();	
+}
+
diff --git a/em-oop/src/JapaneseGreeting.java b/em-oop/src/JapaneseGreeting.java
new file mode 100644
index 0000000..27544f9
--- /dev/null
+++ b/em-oop/src/JapaneseGreeting.java
@@ -0,0 +1,10 @@
+//
+public class JapaneseGreeting implements Greeting{
+	@Override
+	public String hello() {
+		// TODO 自動生成されたメソッド・スタブ
+		return "こんにちは";
+	}
+	
+
+}