Day3 Stept2

em-oop/src/day3Keisho/Day3Check2.java

@@ -0,0 +1,15 @@
+package day3Keisho;
+
+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 rect = new Rectangle(3.0, 4.0);
+		rect.showInfo();
+		
+		Greeting greeting = new JapaneseGreeting();
+		
+		System.out.println(greeting.hello());
+		
+	}
+}

em-oop/src/day3Keisho/Greeting.java

@@ -0,0 +1,6 @@
+package day3Keisho;
+
+public interface Greeting {
+	String hello();
+
+}

em-oop/src/day3Keisho/JapaneseGreeting.java

@@ -0,0 +1,11 @@
+package day3Keisho;
+
+public class JapaneseGreeting implements Greeting {
+	@Override
+	public String hello() {
+		return "こんにちは";
+	}
+	
+	
+
+}

em-oop/src/day3Keisho/Rectangle.java

@@ -0,0 +1,21 @@
+package day3Keisho;
+
+public class Rectangle extends Shape {
+	private double width;
+	private double height;
+	
+	
+	public Rectangle(double width,double height) {
+		super("四角形");
+		this.height=height;
+		this.width=width;
+	}
+
+	@Override
+	public double area() {
+		// TODO 自動生成されたメソッド・スタブ
+		//super.showInfo();
+		return width*height;
+	}
+
+}

em-oop/src/day3Keisho/Shape.java

@@ -1,16 +1,19 @@
 package day3Keisho;
 
-public class Shape {
+//public class Shape { //stept 1
+	
+	public abstract class Shape{ //stept 2
 	private String name;
 
 	public Shape(String name) {
 		this.name = name;
 	}
 
-	public double area() {
-		return 0.0;
-
-	}
+	public abstract double area();  //stept 2
+//	public double area() { //stept 1
+//		return 0.0;
+//
+//	}
 
 	public void showInfo() {
 		System.out.println(this.name + "の面積は" + this.area() + "です");