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，并实现文件操作。-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 a class that implements the interface object　then create five employees object, storage arrays, and to achieve file operations.