java用二维数组保存学生班级姓名成绩的代码,再输入班级姓名查询该学生...答:public class ArrayDemo { public static void main(String[] args) { // 定义二维数组 String[][] studentInfo = { {"Class 1", "Tom", "90"}, {"Class 1", "Jim", "80"}, {"Class 2", "Alice", "99"}, {"Class 2", "John", "75"} }; /...