1. //  现金收费抽象类
    2. public abstract class CashSuper {
    3.     public abstract double acceptCash (Double money);
    4. }
    5. //    此类是正常付款，没有任何折扣返利。。。。
    6. public class CashNormal extends CashSuper {
    8.     public double acceptCash(Double money) {
    9.         return money;
    10.     }
    12. }
    13. // 此类是对各种打折抽象
    14. public class CashRebate  extends CashSuper{
    16.     private String moneyRebate;
    18.     double moneyRebate_d;
    19.     public CashRebate(String moneyRebate) {
    20.          moneyRebate_d = Double.parseDouble(moneyRebate);
    21.     }
    24.     public double acceptCash(Double money) {
    26.         return money * moneyRebate_d;
    27.     }
    29. }
    30. // 满减
    31. public class CashReturn extends CashSuper{
    32.     // 300 -100
    33.     private  double moneyCondition;
    34.     private  double moenyReturn;
    36.     public CashReturn(String moneyCondition, String moenyReturn) {
    37.         super();
    38.         this.moneyCondition = Double.parseDouble(moneyCondition);
    39.         this.moenyReturn = Double.parseDouble(moenyReturn) ;
    40.     }
    42.     public double acceptCash(Double money) {
    44.         if(money>moneyCondition) {
    45.             return money-Math.floor(money/moneyCondition)*moenyReturn;
    46.         }
    47.         return money;
    48.     }
    49. }
    50. // 策略模式与工厂模式的相结合
    51. public class CashContext {
    53.     CashSuper cashSuper;
    55.     private String type;
    57.     public CashContext(String type) {
    58.         this.type=type;
    60.         switch (type) {
    61.         case "正常":
    62.             cashSuper=new CashNormal();
    63.             break;
    64.         case "三折":
    65.             cashSuper=new CashRebate("0.8");
    66.             break;
    67.         case "返现金":
    68.             cashSuper=new CashReturn("300","100");
    69.             break;
    71.         default:
    72.             break;
    73.         }
    74.     }
    76.     public double getResult(Double money) {
    77.         return cashSuper.acceptCash(money);
    78.     }
    79. }