View Compilation Error

0_0_33497364_25993\Main.java:3: 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_33497364_25993\Main.java:4: 错误: 找不到符号
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        ^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_33497364_25993\Main.java:4: 错误: 找不到符号
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                 ^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_33497364_25993\Main.java:4: 错误: 找不到符号
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                     ^
  符号:   类 BufferedReader
  位置: 类 Main
0_0_33497364_25993\Main.java:4: 错误: 找不到符号
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                                        ^
  符号:   类 InputStreamReader
  位置: 类 Main
0_0_33497364_25993\Main.java:5: 错误: 找不到符号
        while(st.nextToken() != StreamTokenizer.TT_EOF){
                                ^
  符号:   变量 StreamTokenizer
  位置: 类 Main
6 个错误