摘要：
package strategy;public abstract class CashSuper { // 现金收费抽象类 public abstract double acceptCash(double money);}package strategy;public class Cas... 阅读全文
摘要：
书上原版的是C#代码我比较熟悉java，写的是java代码。package sampleFactory;public class Operation { protected double _numberA = 0; protected double _numberB = 0; pr... 阅读全文