retangle.java

Java程序设计大学教程程序源代码

package jbookch4;

public class Retangle {
    public Retangle(double l, double w) {
        length = l;
        width = w;
    }

    public double calcPerimeter() {
        return 2 * (length + width);
    }

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

    public String toString() {
        return "长为" + length + "宽为" + width + "的长方形";
    }

    protected double length;
    private double width;

}