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View Compilation Error

0_0_7889094_5047\Main.java:2: 找不到符号
符号: 类 IOException
位置: 类 Main
	public static void main(String[] args) throws IOException {
	                                              ^
0_0_7889094_5047\Main.java:3: 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_7889094_5047\Main.java:3: 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_7889094_5047\Main.java:3: 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_7889094_5047\Main.java:3: 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_7889094_5047\Main.java:4: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		^
0_0_7889094_5047\Main.java:4: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                      ^
0_0_7889094_5047\Main.java:4: 找不到符号
符号: 类 OutputStreamWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                                      ^
0_0_7889094_5047\Main.java:6: 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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