1.　　一个计算费用的抽象类GetFee，其中有计算费用的抽象方法getFee() 一个计算费用的具体类Fee, 实现抽象方法getFee()，费用=收入*费率，不同员工的收入计算方法不同，费率不同，但费率是固定的 一个员工接口Clerk，其中有getIncome()抽象方法；一个教授实现类Professor，其中有getIncome()方法的实现，教授的收入=工资+奖金+导师费用；一个讲师实现类Lecture, 其中有getIncome()方法的实现，讲师的收入=工资+奖金；一个测试类Test。要求输出：员工，教授，张三，工资3000元，奖金500元，导师费用100元，费率2 ，交费72元，已累计交费72元，员工已累计交费72元。员工，讲师，李四，工资2000元，奖金400元，费率1 ，交费24元，已累计交费24元，员工已累计交费96元。-The 1. Costing abstract class GetFee, which costed abstract method getFee ()　a calculation of the costs of specific class Fee abstract methods getFee (), expenses = income* rate, the income of employees calculated in different ways different rates, but the rates are fixed　a staff interface Clerk, which the getIncome () abstract method　a class Professor, Professor, which getIncome () method implementation, Professor income = wages+ bonus+ tutor costs　 of a lecturer implementation class Lecture, which getIncome () method implementation, lecturers income = wages+ bonus　a test class Test. Requirements output: employees, professors, Joe Smith, wages of 3,000 yuan, 500 yuan bonus, tutor costs $ 100, the rate of 2 , and paid 72 yuan, has accumulated to pay 72 yuan, employees have accumulated to pay 72 yuan. Staff, lecturer, John Doe, wages of 2,000 yuan, 400 yuan bonus rate of 1 , and paid 24 yuan, has accumulated to pay 24 yuan, the staff has accumulated to pay 96 yuan.