Java的面向对象编程 掌握类的定义以及继承机制，熟悉方法的多态性。1、　　成下面父类及子类的声明：（1）声明Student类。属性包括学号、姓名、英语成绩、数学成绩、计算机成绩和总成绩。方法包括构造方法、get方法、set方法、toString方法、equals方法、compare方法（比较两个学生的总成绩，结果分大于、小于、等于）、sum方法（计算总成绩）和testScore方法（计算评测成绩，即平均成绩-Java object-oriented programming, as well as grasp the definition of class inheritance mechanism, the polymorphism of familiar methods. 1, into the following categories and sub-category of the father' s statement: (1) Student category statement. Properties include the school number, name, English achievement, mathematics achievement, the computer results and total score. Methods include the construction method, get methods, set methods, toString methods, equals method, compare methods (compare two students with a total score, the outcome is greater than, less than, equal to), sum method (Calculation of total score) and testScore method ( Calculation of assessment results, an average of results