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View Compilation Error

0_0_19404962_5164\Main.java:1: 错误: 类Test4是公共的, 应在名为 Test4.java 的文件中声明
public class Test4 {
       ^
0_0_19404962_5164\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 Test4
0_0_19404962_5164\Main.java:4: 错误: 找不到符号
	BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
	^
  符号:   类 BufferedReader
  位置: 类 Test4
0_0_19404962_5164\Main.java:4: 错误: 找不到符号
	BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
	                         ^
  符号:   类 BufferedReader
  位置: 类 Test4
0_0_19404962_5164\Main.java:4: 错误: 找不到符号
	BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
	                                            ^
  符号:   类 InputStreamReader
  位置: 类 Test4
5 个错误


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