package cn.edu.bjut.chapter3;

public class Rectangle {
	double length = 0, width = 0; // 赋值语句
	// 初始化代码块
	{
		length = 1;
		width = 2;
	}

	// 构造函数
	public Rectangle(double len, double wid) {
		length = len;
		width = wid;
	}

	public double area() {
		return (length * width);
	}

	public static void main(String[] args) {
		Rectangle rect = new Rectangle(30, 20);
		System.out.println(rect.area());
	}
}