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View Compilation Error

0_0_27815461_8067\Main.java:6: 错误: 找不到符号
        ArrayList<Integer> num=new ArrayList<Integer>();
        ^
  符号:   类 ArrayList
  位置: 类 Main
0_0_27815461_8067\Main.java:6: 错误: 找不到符号
        ArrayList<Integer> num=new ArrayList<Integer>();
                                   ^
  符号:   类 ArrayList
  位置: 类 Main
0_0_27815461_8067\Main.java:14: 错误: 找不到符号
          Arrays.sort(a);
          ^
  符号:   变量 Arrays
  位置: 类 Main
0_0_27815461_8067\Main.java:29: 错误: 找不到符号
          Collections.sort(num, new Comparator<Integer>() {
                                    ^
  符号:   类 Comparator
  位置: 类 Main
0_0_27815461_8067\Main.java:29: 错误: 找不到符号
          Collections.sort(num, new Comparator<Integer>() {
          ^
  符号:   变量 Collections
  位置: 类 Main
5 个错误


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