Java程序员能菜到什么程度？我看完这些代码我裂开了！
家人们，今天咱来唠唠那些让人一言难尽的 Java 代码。咱搞 Java 开发，都想写出高效、简洁又好维护的代码，可总有那么些让人怀疑人生的代码出现。下面我就给大伙分享几个真实场景里的“神操作”，结合完整代码，看看这些代码能离谱到啥地步。1. 变量命名之乱，堪比迷宫探险咱先说说变量命名。这就好比给孩子取名字，好名字让人一听就记住，要是乱取，那可就麻烦大了。之前我接手一个电商项目，里面有个计算商品总价的功能。我打开代码一看，差点没晕过去。import java.util.ArrayList;import java.util.List;class Product { private double price; private int quantity;public Product(double price, int quantity) { this.price = price; thisquantity = quantity; }
public double getPrice() { return price; }
public int getQuantity() { return quantity; }}public class ShoppingCart { public static void main(String[] args) { List<Product> list = new ArrayList<>(); list.add(new Product(100, 2)); list.add(new Product(200, 3));
double totalPrice = 0; for (Product product : list) { totalPrice += product.getPrice() * product.getQuantity(); }
System.out.println("总价是：" + totalPrice); }}这里的a是啥玩意儿？完全不知道它代表啥。还有list，这名字太笼统了，谁知道它装的是啥。要是把a改成totalPrice，list改成productList，代码可读性立马就上去了。就好比在迷宫里，有了清晰的路标，找出口就容易多了。【顺便吆喝一句，技术大厂跳板，前/后端or测试，待遇还不错可以试试】2. 方法臃肿之痛，像背了个大包袱方法应该是功能明确、简洁高效的，可有些方法就像个大杂烩。我在一个企业管理系统里，看到一个处理员工请假的方法，那叫一个复杂。import java.util.ArrayList;import java.util.List;class Employee { private String name; private int employeeId;
public Employee(String name, int employeeId) { this.name = name; thisemployeeId = employeeId; }
public String getName() { return name; }
public int getEmployeeId() { return employeeId; }}class LeaveApplication { private Employee applicant; private int days;
public LeaveApplication(Employee applicant, int days) { this.applicant = applicant; this.days = days; }
public Employee getApplicant() { return applicant; }
public int getDays() { return days; }}public class LeaveManagementSystem { private List<Employee> employees = new ArrayList<>(); private List<LeaveApplication> leaveApplications = new ArrayList<>();
public void processLeaveApplication(LeaveApplication application) { // 检查员工是否存在 boolean employeeExists = false; for (Employee employee : employees) { if (employee.getEmployeeId() == application.getApplicant().getEmployeeId()) { employeeExists = true; break; } }
if (!employeeExists) { System.out.println("员工不存在，请假申请失败"); return; }
// 检查请假天数是否合理 if (application.getDays() <= 0) { System.out.println("请假天数必须大于 0，请假申请失败"); return; }
// 记录请假申请 leaveApplications.add(application); System.out.println("请假申请已记录");
// 发送邮件通知上级 sendEmailToSupervisor(application);
// 更新员工剩余假期 updateEmployeeLeaveBalance(application); }
private void sendEmailToSupervisor(LeaveApplication application) { System.out.println("已发送邮件通知上级关于 " + application.getApplicant().getName() + " 的请假申请"); }
private void updateEmployeeLeaveBalance(LeaveApplication application) { System.out.println("已更新 " + application.getApplicant().getName() + " 的剩余假期"); }
public static void main(String[] args) { LeaveManagementSystem system = new LeaveManagementSystem(); Employee employee = new Employee("张三", 1); LeaveApplication application = new LeaveApplication(employee, 5); system.processLeaveApplication(application); }}这个processLeaveApplication方法干了太多事，又是检查员工，又是检查天数，还要记录申请、发邮件、更新假期。这就像一个人背着好几个大包袱走路，累得够呛还容易出错。应该把这些功能拆分成独立的方法，让processLeaveApplication只负责协调，这样代码才好维护。3. 代码重复之苦，复制粘贴的噩梦代码重复是个很常见的问题，就像盖房子，每次都用同样的材料重新砌墙，多浪费啊。我在一个学校管理系统里，看到有两个方法用来计算学生的总分和平均分，代码几乎一模一样。import java.util.ArrayList;import java.util.List;class Student { private String name; private List<Integer> scores;
public Student(String name, List<Integer> scores) { this.name = name; this.scores = scores; }
public String getName() { return name; }
public List<Integer> getScores() { return scores; }}public class ScoreCalculator { public static int calculateTotalScore(Student student) { int total = 0; for (int score : student.getScores()) { total += score; } return total; }
public static double calculateAverageScore(Student student) { int total = 0; for (int score : student.getScores()) { total += score; } int count = student.getScores().size(); return (double) total / count; }
public static void main(String[] args) { List<Integer> scores = new ArrayList<>(); scores.add(80); scores.add(90); scores.add(70);
Student student = new Student("李四", scores);
int totalScore = calculateTotalScore(student); double averageScore = calculateAverageScore(student);
System.out.println("总分：" + totalScore); System.out.println("平均分：" + averageScore); }}这里计算总分和平均分的代码有重复部分。完全可以把计算总分的代码封装成一个方法，在计算平均分的时候调用，这样代码就简洁多了。4. 异常处理之弱，像没穿盔甲上战场异常处理是代码的盔甲，能保护代码不被意外情况击倒。但有些代码的异常处理简直弱得可怜。我看到一个读取文件的代码是这样的。import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException;public class FileReaderExample { public static String readFile(String filePath) { try { BufferedReader reader = new BufferedReader(new FileReader(filePath)); StringBuilder content = new StringBuilder(); String line;
while ((line = reader.readLine()) != null) { content.append(line); }
reader.close(); return content.toString(); } catch (IOException e) { e.printStackTrace(); return null; } }
public static void main(String[] args) { String filePath = "nonexistentfile.txt"; String content = readFile(filePath);
if (content == null) { System.out.println("读取文件失败"); } else { System.out.println(content); } }}这个代码捕获到IOException后，直接返回null，啥也不做。这就像没穿盔甲上战场，敌人来了只能干瞪眼。应该记录日志或者抛出更有意义的异常，让调用者知道具体发生了什么。家人们，写代码可不能这么随意，要多从这些反面例子里吸取教训，写出高质量的代码。要是你们也遇到过类似的“神代码”，让大家一起乐呵乐呵！——转载自：剽悍一小兔
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