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View Compilation Error

0_0_31460663_19683\Main.java:2: 错误: 找不到符号
    public static void main(String[] args) throws IOException {
                                                  ^
  符号:   类 IOException
  位置: 类 Main
0_0_31460663_19683\Main.java:4: 错误: 找不到符号
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        ^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_31460663_19683\Main.java:4: 错误: 找不到符号
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                 ^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_31460663_19683\Main.java:4: 错误: 找不到符号
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                     ^
  符号:   类 BufferedReader
  位置: 类 Main
0_0_31460663_19683\Main.java:4: 错误: 找不到符号
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                                        ^
  符号:   类 InputStreamReader
  位置: 类 Main
0_0_31460663_19683\Main.java:5: 错误: 找不到符号
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        ^
  符号:   类 PrintWriter
  位置: 类 Main
0_0_31460663_19683\Main.java:5: 错误: 找不到符号
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
                              ^
  符号:   类 PrintWriter
  位置: 类 Main
0_0_31460663_19683\Main.java:5: 错误: 找不到符号
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
                                              ^
  符号:   类 OutputStreamWriter
  位置: 类 Main
0_0_31460663_19683\Main.java:7: 错误: 找不到符号
        while (in.nextToken() != StreamTokenizer.TT_EOF) {
                                 ^
  符号:   变量 StreamTokenizer
  位置: 类 Main
9 个错误


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