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。方法包括构造方法、get方法、set方法、toString方法、equals方法、compareTo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）。-Declared the Student class. Properties include the student number, name, English, mathematics, computer performance. Methods include constructors, get method, set method, toString method, equals method, compareTo method (compare two students with a total score, the results point greater than, less than, equal to), sum method (calculated total score) and testScore methods ( calculation of evaluation results, the average score).