FreeDeduction.java

package com.cheng.zenofdesignpatterns.perfectworld.factory_strategy;

/**
 * 扣款策略二
 * 自由扣款策略
 */
public class FreeDeduction implements IDeduction {

    //自由扣款
    public boolean exec(Card card, Trade trade) {
        //直接从自由余额中扣除
        card.setFreeMoney(card.getFreeMoney() - trade.getAmount());
        return true;
    }

}