重构之以函数对象取代函数

最新推荐文章于 2023-03-16 20:29:18 发布

原创最新推荐文章于 2023-03-16 20:29:18 发布 · 579 阅读

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文章标签：

#重构 #函数对象 #封装 #java

以函数对象取代函数

重构导图

代码

/**
 * 重构前
 */
class Account {
    int gamma(int inputVal, int quantity, int yearToDate) {
        int importantValue1 = (inputVal + quantity) + delta();
        int importantValue2 = (inputval * yearToDate) + 100;
        if((yearToDate - importantValue1) > 100)
            importantValue2 -= 20;
        int importantValue3 = importantValue2 * 7;
        return importantValue3 - 2 * importantValue1;
    }
}

/**
 * 以函数对象取代函数后
 */
class Account {
    int gamma(int inputVal, int quantity, int yearToDate) {
        return new gamma(this, inputVal, quantity, yearToDate);
    }
}

class Gamma {
    private final Account account;
    private int inputVal;
    private int quantity;
    private int yearToDate;
    private int importantValue1;
    private int importantValue2;
    private int importantValue3;

    public Gamma(Account account, int inputVal, int quantity, int yearToDate) {
        this.account = account;
        this.inputVal = inputVal;
        this.quantity = quantity;
        this.yearToDate = yearToDate;
    }

    public int compute() {
        importantValue1 = (inputVal + quantity) + account.delta();
        importantValue2 = (inputval * yearToDate) + 100;
        if((yearToDate - importantValue1) > 100)
            importantValue2 -= 20;
        importantValue3 = importantValue2 * 7;
        return importantValue3 - 2 * importantValue1;
    }
}

/**
 * 提炼函数后
 */
class Account {
    int gamma(int inputVal, int quantity, int yearToDate) {
        return new gamma(this, inputVal, quantity, yearToDate);
    }
}

class Gamma {
    private final Account account;
    private int inputVal;
    private int quantity;
    private int yearToDate;
    private int importantValue1;
    private int importantValue2;
    private int importantValue3;

    public Gamma(Account account, int inputVal, int quantity, int yearToDate) {
        this.account = account;
        this.inputVal = inputVal;
        this.quantity = quantity;
        this.yearToDate = yearToDate;
    }

    public int compute() {
        importantValue1 = (inputVal + quantity) + account.delta();
        importantValue2 = (inputval * yearToDate) + 100;
        importantThing();
        importantValue3 = importantValue2 * 7;
        return importantValue3 - 2 * importantValue1;
    }

    private void importantThing() {
        if((yearToDate - importantValue1) > 100)
            importantValue2 -= 20;
    }
}

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