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View Compilation Error

0_0_21441602_15152\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_21441602_15152\Main.java:11: 错误: 找不到符号
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_21441602_15152\Main.java:11: 错误: 找不到符号
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		                         ^
  符号:   类 StreamTokenizer
  位置: 类 Main
0_0_21441602_15152\Main.java:11: 错误: 找不到符号
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		                                             ^
  符号:   类 BufferedReader
  位置: 类 Main
0_0_21441602_15152\Main.java:12: 错误: 找不到符号
				new InputStreamReader(System.in)));
				    ^
  符号:   类 InputStreamReader
  位置: 类 Main
0_0_21441602_15152\Main.java:13: 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_21441602_15152\Main.java:13: 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_21441602_15152\Main.java:13: 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_21441602_15152\Main.java:31: 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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