大话设计模式java版本 第二章 策略模式

package strategy;//嵌入策略public class CashContext {    private Cash cs;    public CashContext(Cash cs) {        super();        this.cs = cs;    }    public double getResult(double money){        return cs.acceptCash(money);    }}

package strategy;public interface Cash {    public abstract double acceptCash(double money);}

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

package strategy;/* * 打折策略 */public class CashRebate implements Cash{    private double moneyRebate;    public CashRebate() {        super();    }    public CashRebate(double moneyRebate) {        super();        this.moneyRebate = moneyRebate;    }    public double getMoneyRebate() {        return moneyRebate;    }    public void setMoneyRebate(double moneyRebate) {        this.moneyRebate = moneyRebate;    }    @Override    public double acceptCash(double money) {            return money*moneyRebate;    }}

package strategy;/* * 返利收费策略 */public class CashReturn implements Cash {    private double moneyCondition;    private double moneyReturn;    public CashReturn() {        super();    }    public CashReturn(double moneyCondition, double moneyReturn) {        super();        this.moneyCondition = moneyCondition;        this.moneyReturn = moneyReturn;    }    public double getMoneyCondition() {        return moneyCondition;    }    public void setMoneyCondition(double moneyCondition) {        this.moneyCondition = moneyCondition;    }    public double getMoneyReturn() {        return moneyReturn;    }    public void setMoneyReturn(double moneyReturn) {        this.moneyReturn = moneyReturn;    }    @Override    public double acceptCash(double money) {        if(money>=moneyCondition){            return money-(int)(money/moneyCondition)*moneyReturn;        }        return money;    }}

测试类：

package strategy;import java.util.Scanner;/* * 测试代码 */public class test {    public static void main(String[] args) {        CashContext cc=null;        double moneyRebate=0;        double money=0;        Scanner sc= new Scanner(System.in);        System.out.println("请输入折扣类型");        String type = sc.next();        switch (type) {        case "正常收费":            cc=new CashContext(new CashNormal());            break;        case "打折":            System.out.println("请输入打折比例");            moneyRebate=sc.nextDouble();            cc=new CashContext(new CashRebate(moneyRebate));            break;        case "返利":            cc=new CashContext(new CashReturn(500, 50));            break;        }        System.out.println("请输入金额");        money = sc.nextDouble();        System.out.println(cc.getResult(money));    }}