rectangledemo.java

来自「Java 程序设计源码 只提供了部分」· Java 代码 · 共 37 行

class Rectangle {
	private double width;
	private double height;

	public Rectangle(double width,double height) {
		this.width = width;
		this.height = height;
	}

	public double area() {
		double area;
	
		area = width * height;

		return area;
	}

	public double perimeter() {
		double perimeter;
		
		perimeter = 2 * (width + height);

		return perimeter;
	}
	
}

public class RectangleDemo {
	public static void main(String[] args) {
		Rectangle rec;

		rec = new Rectangle(2,3);

		System.out.println(rec.area());
		System.out.println(rec.area());
	}
}