定義并測試一個代表員工的Employee類。員工屬性包括“編號”、“姓名”、“基本工資”、”工資增長率“，還包括計算薪水增長額及計算增長后的工資總額的操作方法。 ```java //員工類 public class Employee{ private long eid; private String ename; private double salary; private double rate; public Employee() { } public Employee(long eid,String ename,double salary,double rate) { this.eid=eid; this.ename=ename; this.salary=salary; this.rate=rate; } public String getInfo() { return "編號："+this.eid + "、姓名："+this.ename+"、工資："+this.salary+"、增長率："+this.rate; } public double salaryRate() { return this.salary*this.rate; } public double salaryadd() { this.salary=this.salary*(1+this.rate); return this.salary; } } //測試類 public class Test { public static void main(String args[]) { Employee emp = new Employee(134L,"張三",3000.0,0.3); System.out.println(emp.getInfo()); System.out.println("工資調整額度："+emp.salaryRate()); System.out.println("上調后的工資："+emp.salaryadd()); System.out.println(emp.getInfo()); } } ```