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View Compilation Error

0_0_33798686_10313\Main.java:14: 错误: 找不到符号
        Scanner sc = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_33798686_10313\Main.java:14: 错误: 找不到符号
        Scanner sc = new Scanner(System.in);
                         ^
  符号:   类 Scanner
  位置: 类 Main
0_0_33798686_10313\Main.java:16: 错误: 找不到符号
        List<Time> list= new ArrayList<>();
        ^
  符号:   类 List
  位置: 类 Main
0_0_33798686_10313\Main.java:16: 错误: 找不到符号
        List<Time> list= new ArrayList<>();
                             ^
  符号:   类 ArrayList
  位置: 类 Main
0_0_33798686_10313\Main.java:22: 错误: 找不到符号
        Collections.sort(list, new Comparator<Time>() {
                                   ^
  符号:   类 Comparator
  位置: 类 Main
0_0_33798686_10313\Main.java:22: 错误: 找不到符号
        Collections.sort(list, new Comparator<Time>() {
        ^
  符号:   变量 Collections
  位置: 类 Main
6 个错误


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