利用接口技术周长

题目：

1、通过程序设计几何图形（Shape）、矩形（Rectangle）、圆形（Circle）、正方形（Square）几种类型，能够利用接口和多态性计算几何图形的面积和周长并显示。

 

周长面积代码

interface zhouchang{

public void zhouchang();

}

interface mianji{

public void mianji();

}

abstract class zong implements zhouchang,mianji {

int chang,kuan,banjing,zhouchang,mianji;

public zong(int chang,int kuan,int banjing) {

this.chang  = chang;

this.kuan = kuan;

this.banjing = banjing;

}

}

class Rectangle extends zong{

public Rectangle(int chang, int kuan, int banjing) {

super(chang, kuan, banjing);

}

public void zhouchang(){

zhouchang = (chang+kuan)*2;

System.out.println("矩形的周长是:"+zhouchang);

}public void mianji(){

mianji = chang*kuan;

System.out.println("矩形的面积是:"+mianji);

}

}

class Circle extends zong{

public Circle(int chang, int kuan, int banjing) {

super(chang, kuan, banjing);

}

public void zhouchang(){

zhouchang = (int) (2*3.14*banjing);

System.out.println("圆形的周长是:"+zhouchang);

}

public void mianji(){

mianji = (int) (3.14*(banjing*banjing));

System.out.println("圆形的面积是:"+mianji);

}

}

class Square extends zong{

public Square(int chang, int kuan, int banjing) {

super(chang, kuan, banjing);

}

public void zhouchang(){

zhouchang = (chang+kuan)*2;

System.out.println("正方形的周长是:"+zhouchang);

}

public void mianji(){

mianji = chang*kuan;

System.out.println("正方形的面积是:"+mianji);

}

}

public class zcmj {

public static void main(String[] args) {

Rectangle re = new Rectangle(10,12, 0);

re.zhouchang();

re.mianji();

Circle ci = new Circle(0, 0, 10);

ci.zhouchang();

ci.mianji();

Square sq = new Square(12, 12, 0);

sq.zhouchang();

sq.mianji();

}

} 

运行结果