编写一个员工类，成员变量包括编号、姓名、年龄、工资、身份证号码、员工人数、员工工资总额。

在编写一个员工类时，我们可以考虑如下结构：

public class Employee {
    private int employeeID; // 编号
    private String name; // 姓名
    private int age; // 年龄
    private double salary; // 工资
    private String idNumber; // 身份证号码

    // 构造函数
    public Employee(int id, String name, int age, double salary, String idNumber) {
        this.employeeID = id;
        this.name = name;
        this.age = age;
        this.salary = salary;
        this.idNumber = idNumber;
    }

    // 获取和设置方法
    public int getEmployeeID() { return employeeID; }
    public void setEmployeeID(int employeeID) { this.employeeID = employeeID; }

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

    public int getAge() { return age; }
    public void setAge(int age) { this.age = age; }

    public double getSalary() { return salary; }
    public void setSalary(double salary) { this.salary = salary; }

    public String getIdNumber() { return idNumber; }
    public void setIdNumber(String idNumber) { this.idNumber = idNumber; }

    // 计算员工总人数和工资总额的相关方法
    public static int getTotalEmployees(Employee[] employees) {
        int total = employees.length;
        return total;
    }

    public static double getTotalSalary(Employee[] employees) {
        double totalSalary = 0;
        for (Employee employee : employees) {
            totalSalary += employee.getSalary();
        }
        return totalSalary;
    }
}

在这个类中，我们有基本的成员变量，还包含了构造函数用于初始化这些属性。同时，为了方便统计所有员工的总数和工资总额，我们添加了静态方法`getTotalEmployees`和`getTotalSalary`。