2019-04-10

package day11Test1;

public class XingZhuang {

public static void abc(XingZhuang xz) {

if (xz instanceof YuanXing) {

((YuanXing) xz).r = 2;

System.out.println(((YuanXing) xz).mianJi());// 圆形的面积

System.out.println(((YuanXing) xz).zhouChang());// 圆形的周长

} else if (xz instanceof ChangFangXing) {

((ChangFangXing) xz).chang = 10;

((ChangFangXing) xz).kuan = 10;

System.out.println(((ChangFangXing) xz).mianJi());// 长方形的面积

System.out.println(((ChangFangXing) xz).zhouChang());// 长方形的周长

}

}

}