Revision of InterfaceDemo.java

1 file changed, 28 insertions

InterfaceDemo.java(檔案已創建)

		@@ -0,0 +1,28 @@
1	+	interface Shape {
2	+	double area();
3	+	double perimeter();
4	+	}
5	+
6	+	class Circle implements Shape {
7	+	private double radius;
8	+
9	+	public Circle(double radius) {
10	+	this.radius = radius;
11	+	}
12	+
13	+	public double area() {
14	+	return Math.PI * radius * radius;
15	+	}
16	+
17	+	public double perimeter() {
18	+	return 2 * Math.PI * radius;
19	+	}
20	+	}
21	+
22	+	public class InterfaceDemo {
23	+	public static void main(String[] args) {
24	+	Circle circle = new Circle(5.0);
25	+	System.out.println("Circle Area: " + circle.area());
26	+	System.out.println("Circle Perimeter: " + circle.perimeter());
27	+	}
28	+	}