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View Compilation Error

0_0_19032321_13445\Main.java:1: 错误: 类test是公共的, 应在名为 test.java 的文件中声明
public class test{
       ^
0_0_19032321_13445\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 test
0_0_19032321_13445\Main.java:4: 错误: 找不到符号
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  ^
  符号:   类 BufferedReader
  位置: 类 test
0_0_19032321_13445\Main.java:4: 错误: 找不到符号
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                          ^
  符号:   类 BufferedReader
  位置: 类 test
0_0_19032321_13445\Main.java:4: 错误: 找不到符号
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                             ^
  符号:   类 InputStreamReader
  位置: 类 test
5 个错误


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