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View Compilation Error

0_0_39213788_16661\Main.java:3: 错误: 找不到符号
        Scanner input = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_39213788_16661\Main.java:3: 错误: 找不到符号
        Scanner input = new Scanner(System.in);
                            ^
  符号:   类 Scanner
  位置: 类 Main
0_0_39213788_16661\Main.java:7: 错误: 找不到符号
            Arrays.sort(chars);
            ^
  符号:   变量 Arrays
  位置: 类 Main
0_0_39213788_16661\Main.java:8: 错误: 找不到符号
            System.out.println(Arrays.toString(chars));
                               ^
  符号:   变量 Arrays
  位置: 类 Main
4 个错误


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