package cn.edu.bjut.chapter3;

public final class RectangleFinal {
    double length = 0, width = 0; // 赋值语句
	
    public Rectangle(double length, double width) {
        this.length = length; 
        this.width = width;
    }
    
    
    double area() {
        return (length*width);
    }
}