Java 练习

Rectangle.java

package Rectangle;

class myRectangle {
    double width = 1.0;
    double height = 1.0;
    
    myRectangle() {
    	
    }
    
    myRectangle(double newWidth, double newHeight) {
    	width = newWidth;
    	height = newHeight;
    }
    
    double getArea() {
    	return width * height;
    }
    
    double getPerimeter() {
    	return width * height;
    }
}

public class Rectangle{
	public static void main(String[] args) {
		myRectangle r1 = new myRectangle();
		r1.width = 4;
		r1.height = 40;
		System.out.println(r1.getArea());
		
	}
}