编写一个java程序，定义并测试一个代表员工的Employee类。员工属性包括“编号”、“姓名”、“基本薪水”、“薪水增长额”；还包括 “计算增长后的工资总额”。

下面是一个可能的 Employee 类的实现：

public class Employee {
    private int id;
    private String name;
    private double salary;
    private double salaryIncrease;

    public Employee(int id, String name, double salary, double salaryIncrease) {
        this.id = id;
        this.name = name;
        this.salary = salary;
        this.salaryIncrease = salaryIncrease;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public double getSalary() {
        return salary;
    }

    public double getSalaryIncrease() {
        return salaryIncrease;
    }

    public double getTotalSalary() {
        return salary + salaryIncrease;
    }

    public void setSalaryIncrease(double salaryIncrease) {
        this.salaryIncrease = salaryIncrease;
    }
}

这个类有四个属性：员工编号，姓名，基本薪水和薪水增长额。它还有一个计算增长后的工资总额的方法 getTotalSalary()。还有一个 setter 方法 setSalaryIncrease() 可以用来设置薪水增长额。

下面是一个例子，展示如何使用 Employee 类：

public class Main {
    public static void main(String[] args) {
        Employee employee = new Employee(1, "John Smith", 50000, 5000);
        System.out.println("Employee name: " + employee.getName());
        System.out.println("Employee salary: " + employee.getSalary());
        System.out.println("Employee salary increase: " + employee.getSalaryIncrease());
        System.out.println("Employee total salary: " + employee.getTotalSalary());
        employee.setSalaryIncrease(6000);
        System.out.println("Employee total salary after increase: " + employee.getTotalSalary());
    }
}

这个例子创建了一个 Employee 对象，打印出了员工的姓名，基本薪水，薪水增长额和工资总额。然后，它使用 setSalaryIncrease() 方法增加了薪水增长额，再次打印出工资总额。输出应该如下：

Employee name: John Smith
Employee salary: 50000.0
Employee salary increase: 5000.0
Employee total salary: 55000.0
Employee total salary after increase: 56000.0