程序中定义一个员工类、一个查看员工薪资的接口和两个实现接口的类。在main()方法中创建二维数组并将数组信息填入数组，定义接口的引用使用多态。接口的引用必须是实现了接口的类的对象；再创建5个员工对象，用数组存储。-Program to define a class of employees, a view employee payroll interface and two classes that implement the interface. Create a two-dimensional array and the array of information to fill an array of the main () method, a reference to the definition of the interface to use polymorphism. Interface reference must be to achieve the objects of the class interface　then create five employees object, stored in an array.