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View Compilation Error

0_0_7913468_24975\Main.java:3: 找不到符号
符号: 类 IOException
位置: 类 Main
    public static void main(String[] args) throws IOException
                                                  ^
0_0_7913468_24975\Main.java:5: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        ^
0_0_7913468_24975\Main.java:5: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                 ^
0_0_7913468_24975\Main.java:5: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                     ^
0_0_7913468_24975\Main.java:5: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                                        ^
0_0_7913468_24975\Main.java:6: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        ^
0_0_7913468_24975\Main.java:6: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
                              ^
0_0_7913468_24975\Main.java:6: 找不到符号
符号: 类 OutputStreamWriter
位置: 类 Main
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
                                              ^
0_0_7913468_24975\Main.java:8: 找不到符号
符号: 变量 StreamTokenizer
位置: 类 Main
        while(in.nextToken() != StreamTokenizer.TT_EOF)
                                ^
9 错误


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