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View Compilation Error

0_0_33390674_25843\Main.java:4: 错误: 找不到符号
        List<Stu> stuList = new ArrayList<>();
        ^
  符号:   类 List
  位置: 类 Main
0_0_33390674_25843\Main.java:4: 错误: 找不到符号
        List<Stu> stuList = new ArrayList<>();
                                ^
  符号:   类 ArrayList
  位置: 类 Main
0_0_33390674_25843\Main.java:6: 错误: 找不到符号
            Scanner scanner = new Scanner(System.in);
            ^
  符号:   类 Scanner
  位置: 类 Main
0_0_33390674_25843\Main.java:6: 错误: 找不到符号
            Scanner scanner = new Scanner(System.in);
                                  ^
  符号:   类 Scanner
  位置: 类 Main
0_0_33390674_25843\Main.java:42: 错误: 找不到符号
            stuList = new ArrayList<>();
                          ^
  符号:   类 ArrayList
  位置: 类 Main
0_0_33390674_25843\Main.java:63: 错误: 找不到符号
        return Objects.hash(id, score);
               ^
  符号:   变量 Objects
  位置: 类 Stu
6 个错误


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