java/w3/Employee.java

public class Employee {
    // 1. 定义私有属性
    private String id;
    private String name;
    private String department;
    private double salary;

    // 最低工资标准，设为常量
    private static final double MIN_SALARY = 2000.0;

    /**
     * 2. 提供必要的构造方法
     * 这里提供一个全参构造方法
     */
    public Employee(String id, String name, String department, double salary) {
        this.id = id;
        this.name = name;
        this.department = department;
        // 使用 setSalary 方法来确保初始工资符合标准
        this.setSalary(salary);
    }

    // 3. 提供合理的 getter 和 setter 方法

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }

    public double getSalary() {
        return salary;
    }

    /**
     * 在 setSalary 中检查工资必须大于等于最低工资标准
     */
    public void setSalary(double salary) {
        if (salary >= MIN_SALARY) {
            this.salary = salary;
        } else {
            System.out.println("工资 " + salary + " 低于最低标准 " + MIN_SALARY + "，已自动设置为最低标准。");
            this.salary = MIN_SALARY;
        }
    }

    /**
     * 4. 添加一个 raiseSalary 方法，按照百分比增加工资
     * percent 为 5 表示增加 5%
     */
    public void raiseSalary(double percent) {
        if (percent < 0) {
            System.out.println("增长率不能为负数，增长无效。");
            return;
        }
        double raiseAmount = this.salary * (percent / 100.0);
        this.salary += raiseAmount;
        // 确保增加后仍不低于最低工资
        if (this.salary < MIN_SALARY) {
            this.salary = MIN_SALARY;
        }
        System.out.println("工资已按 " + percent + "% 的比例增长。");
    }

    /**
     * 为了方便打印对象信息，重写 toString 方法
     */
    @Override
    public String toString() {
        return "Employee{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", department='" + department + '\'' +
                ", salary=" + salary +
                '}';
    }
}