Big talk design mode Java version Chapter II policy mode

package strategy;//嵌入策略publicclass CashContext {    private Cash cs;    publicCashContext(Cash cs) {        super();        this.cs = cs;    }    publicdoublegetResult(double money){        return cs.acceptCash(money);    }}

package strategy; Public  interface  Cash {public  abstract  double   Acceptcash  (double  Money);}  

package strategy;/* * 正常收费 */publicclass CashNormal implements Cash{    @Override    publicdoubleacceptCash(double money) {        return money;    }}

 Packagestrategy;/ * Discount strategy * / Public  class cashrebate implements Cash{    Private DoubleMoneyrebate; Public cashrebate() {Super(); } Public cashrebate(DoubleMoneyrebate) {Super(); This. moneyrebate = moneyrebate; } Public Double getmoneyrebate() {returnMoneyrebate; } Public void setmoneyrebate(DoubleMoneyrebate) { This. moneyrebate = moneyrebate; }@Override     Public Double Acceptcash(DoubleMoney) {returnMoney*moneyrebate; }}

 Packagestrategy;/ * Rebate Charge Strategy */ Public  class Cashreturn implements Cash {    Private DoubleMoneycondition;Private DoubleMoneyreturn; Public Cashreturn() {Super(); } Public Cashreturn(DoubleMoneycondition,DoubleMoneyreturn) {Super(); This. moneycondition = moneycondition; This. Moneyreturn = Moneyreturn; } Public Double getmoneycondition() {returnMoneycondition; } Public void setmoneycondition(DoubleMoneycondition) { This. moneycondition = moneycondition; } Public Double Getmoneyreturn() {returnMoneyreturn; } Public void Setmoneyreturn(DoubleMoneyreturn) { This. Moneyreturn = Moneyreturn; }@Override     Public Double Acceptcash(DoubleMoney) {if(money>=moneycondition) {returnmoney-(int) (money/moneycondition) *moneyreturn; }returnMoney }}

Test class:

Package Strategy;import Java.util.Scanner;/ * * Test code * / Public classTest { Public Static void Main(string[] args) {Cashcontext cc=NULL;DoubleMoneyrebate=0;Doublemoney=0; Scanner sc=NewScanner (System.inch); System. out. println ("Please enter a discount type"); String type = Sc.next ();Switch(type) { Case "Normal charge": cc=NewCashcontext (NewCashnormal ()); Break; Case "Discount": System. out. println ("Please enter the discount ratio");            Moneyrebate=sc.nextdouble (); Cc=NewCashcontext (NewCashrebate (moneyrebate)); Break; Case "Rebate": cc=NewCashcontext (NewCashreturn ( -, -)); Break; } System. out. println ("Please enter Amount");        Money = Sc.nextdouble (); System. out. println (Cc.getresult (money)); }}

Big talk design mode Java version Chapter II policy mode