第九章简化条件表达式

最新推荐文章于 2025-08-08 15:01:07 发布

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#java #读书笔记

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本文详细解读了Java编程中条件表达式的使用技巧和优化方法，通过实例解析了如何简化复杂的条件判断，提升代码的可读性和效率。适合Java初学者和进阶者阅读。

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/*分解条件表达式*/

if (date.before (SUMMER_START) || date.after(SUMMER_END))
charge = quantity * _winterRate + _winterServiceCharge;
else charge = quantity * _summerRate;

整理后

if (notSummer(date))
charge = winterCharge(quantity);
else charge = summerCharge (quantity);


private boolean notSummer(Date date) {
return date.before (SUMMER_START) || date.after(SUMMER_END);
}
private double summerCharge(int quantity) {
return quantity * _summerRate;
}
private double winterCharge(int quantity) {
return quantity * _winterRate + _winterServiceCharge;
}

/**********************合并条件表达式*********************************/

double disabilityAmount() {
if (_seniority < 2) return 0;
if (_monthsDisabled > 12) return 0;
if (_isPartTime) return 0;
// compute the disability amount

整理后

double disabilityAmount() {
if ((_seniority < 2) || (_monthsDisabled > 12) || (_isPartTime))
return 0;
// compute the disability amount
...

整理后

double disabilityAmount() {
if (isNotEligibleForDisability()) return 0;
// compute the disability amount
...
}
boolean isNotEligibleForDisability() {
return ((_seniority < 2) || (_monthsDisabled > 12) ||
(_isPartTime));
}

/***************************合并重复的片段********************************/

if (isSpecialDeal()) {
total = price * 0.95;
send();
}
else {
total = price * 0.98;
send();
}

整理后

<pre name="code" class="java">if (isSpecialDeal())
total = price * 0.95;
else
total = price * 0.98;
send();