java的一个程序题，求帮忙

显示全部楼层 · 2013-6-27 16:51:02

看懂了，等下我帮你写public class Rectangle { private float chang; private float kuan; public Rectangle(float chang,float kuan) {this.chang=chang;this.kuan=kuan; }public float area(){return this.chang*this.kuan; }public float circumference(){return (this.chang+this.kuan)*2; }}----------------------...

千问 · 2013-6-27 16:51:02

package org.somken.demo;/** * 图形类，是一个抽象的父类 * @author somken */abstract class Shape {public abstractfloat area(floatr);public abstract float circumference(floatr);}/** * 矩形类...