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unreported exception must be caught の原因と直し方

検査例外と非検査例外の境界。

 1  import java.io.*;
 2  
 3  public class Main {
 4      static class MyRes implements Closeable {
 5          public void close() throws IOException { throw new IOException("x"); }
 6      }
 7      public static void main(String[] args)____________________ {
                                                        ^
 8          try (MyRes r = new MyRes()) {
 9              System.out.println("ok");
10          }
11      }
12  }