第48問

このプログラムを実行したときの出力はどれか。

 1: class Valve implements AutoCloseable {
 2:     public void close() { throw new IllegalStateException("valve"); }
 3: }
 4: public class Main {
 5:     public static void main(String[] args) {
 6:         try (Valve v = new Valve()) {
 7:             System.out.println("work ok");
 8:         } catch (IllegalStateException e) {
 9:             System.out.println("caught " + e.getMessage());
10:             System.out.println(e.getSuppressed().length);
11:         }
12:     }
13: }