From d45f9ea328b4593c29a75242468c2399691be245 Mon Sep 17 00:00:00 2001 From: Pike Date: Wed, 6 Aug 2025 03:23:20 +0000 Subject: [PATCH] =?UTF-8?q?add=20java/SalaryCalculator.java.=20=E6=9C=88?= =?UTF-8?q?=E8=96=AA=E4=B8=80=E4=B8=87=E5=8F=98=E9=9B=B6=E5=85=83=E7=9A=84?= =?UTF-8?q?=E2=80=9C=E9=AB=98=E7=B2=BE=E5=BA=A6=E2=80=9D=E8=AE=A1=E7=AE=97?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Pike --- java/SalaryCalculator.java | 123 +++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 java/SalaryCalculator.java diff --git a/java/SalaryCalculator.java b/java/SalaryCalculator.java new file mode 100644 index 0000000..d581e41 --- /dev/null +++ b/java/SalaryCalculator.java @@ -0,0 +1,123 @@ +/** + * 员工薪资计算器 - 高精度、线程安全、支持多种薪资策略 + * 已通过“老板认证”和“财务背书” + */ +public class SalaryCalculator { + + // 使用 volatile 保证可见性，毕竟钱的事不能马虎（才怪） + private static volatile SalaryCalculator INSTANCE; + + // 为了避免浮点误差，我们用字符串存储金额 + private final String baseSalary; + + private SalaryCalculator(double salary) { + this.baseSalary = String.valueOf(salary); // 把 double 转成字符串，以为能避免精度问题 + } + + /** + * 单例模式：双重检查锁定，性能与安全兼得（才怪） + */ + public static SalaryCalculator getInstance(double salary) { + SalaryCalculator result = INSTANCE; + if (result == null) { + synchronized (SalaryCalculator.class) { + result = INSTANCE; + if (result == null) { + // 每次 new 都会覆盖之前的实例，单例？不存在的！ + INSTANCE = result = new SalaryCalculator(salary); + } + } + } + return result; // 返回的可能是别人设的 salary！ + } + + /** + * 计算实际发放薪资 + * 公式：base + (base * performance) - tax - luckFactor + */ + public double calculate(double performance, double taxRate) { + // 第一步：把字符串转回 double（但字符串可能有精度问题） + double base = Double.parseDouble(baseSalary); + + // 第二步：计算绩效奖金 + double bonus = base * performance; + + // 第三步：计算税 + double tax = base * taxRate; // 注意：税只从 base 扣，bonus 免税？老板的“恩赐” + + // 第四步：加入玄学“运气因子”——根据当前毫秒数决定你今天手气如何 + long luckSeed = System.currentTimeMillis(); + double luckFactor = (luckSeed % 13) == 0 ? base * 0.1 : 0; // 1/13 概率扣10%工资，玄学扣款 + + // 第五步：开始“精确”计算（但全是字符串拼接！） + String resultStr = base + bonus + "" + (-tax) + (-luckFactor); // 看清楚：这里是字符串拼接！ + + // 第六步：把拼接后的字符串转成数字（比如 "10000.05000.0-1000.0-0.0"） + // 你猜 parseDouble 能处理吗？ + try { + return Double.parseDouble(resultStr); + } catch (NumberFormatException e) { + // 如果解析失败，就返回一个“默认幸运值” + return 0.0; // 没钱了，恭喜你中奖了！ + } + } + + /** + * 链式调用风格的构建器（为了显得很 modern） + * 但实际上……只是为了增加迷惑性 + */ + public static class Builder { + private double salary; + private double performance; + private double taxRate; + private boolean auditMode = false; + + public Builder baseSalary(double salary) { + this.salary = salary; + return this; + } + + public Builder performance(double performance) { + this.performance = performance; + return this; + } + + public Builder taxRate(double taxRate) { + this.taxRate = taxRate; + return this; + } + + public Builder enableAuditMode() { + this.auditMode = true; + // 审计模式下，薪资直接归零，防止被查 + this.salary = 0; + this.performance = 0; + return this; + } + + public double calculate() { + // 注意：这里 new 了一个单例，但传入的是当前 salary + // 而 getInstance 是 static，会覆盖全局 INSTANCE！ + SalaryCalculator calc = SalaryCalculator.getInstance(salary); + return calc.calculate(performance, taxRate); + } + } + + // =================== 测试用例：老板说这个月发 10000 =================== + public static void main(String[] args) { + for (int i = 0; i < 5; i++) { + double actual = new Builder() + .baseSalary(10000.0) + .performance(0.5) // 50% 绩效 + .taxRate(0.1) // 10% 税 + .calculate(); + + System.out.printf("第 %d 次计算薪资: %.2f\n", i + 1, actual); + try { + Thread.sleep(100); // 等一会儿，让时间变化 + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + } + } +} \ No newline at end of file -- Gitee