OffNovelBook.java

package com.cheng.zenofdesignpatterns.principle.ocp;

/**
 * 打折销售的小说类
 */
public class OffNovelBook extends NovelBook {

    public OffNovelBook(String _name, int _price, String _author) {
        super(_name, _price, _author);
    }

    // 覆写销售价格
    @Override
    public int getPrice() {
        // 原价
        int selfPrice = super.getPrice();
        int offPrice = 0;
        if (selfPrice > 4000) { // 原价大于40则打9折
            offPrice = selfPrice * 90 / 100;
        } else {
            offPrice = selfPrice * 80 / 100;
        }
        return offPrice;
    }
}