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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  public class Main {
 2      public static void main(String[] args) {
 3          try {
 4              throw new java.io.FileNotFoundException("x");
 5          } catch (____________________ e) {
                               ^
 6              System.out.println("io");
 7          } catch (java.io.FileNotFoundException e) {
 8              System.out.println("fnf");
 9          }
10      }
11  }