张九川第9次作业
摘要:
package tuxing; public interface shape { abstract double getarea();//创建接口 } package tuxing; public class yuanxing implements shape {//圆形类 final double p = 3.14; double r; yuanxing(double r) { this.r = 阅读全文
posted @ 2019-10-14 15:58 张九川 阅读(207) 评论(0) 推荐(0) 编辑