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| 1 | +import java.io.Closeable; |
| 2 | +import java.io.IOException; |
| 3 | + |
| 4 | +/** |
| 5 | + * Every class that implements those two interfaces can be closed automatically in a try with resource block. |
| 6 | + * |
| 7 | + * Closeable vs AutoCloesable |
| 8 | + * @link{https://stackoverflow.com/questions/13141302/implements-closeable-or-implements-autocloseable} |
| 9 | + * Closeable extends AutoCloseable. |
| 10 | + * Closeable close() method throws IOException. |
| 11 | + * AutoCloseable close() method throws Exception. |
| 12 | + * |
| 13 | + * Inner static class can access outer class static field without the need of referencing the outer class. |
| 14 | + * |
| 15 | + **/ |
| 16 | +public class Challenge_3 { |
| 17 | + |
| 18 | + static String marvelHero = ""; |
| 19 | + |
| 20 | + public static void main( String[] args ) throws IOException { |
| 21 | + Logan logan = new Logan(); |
| 22 | + //firstly, the new PeterParker() instruction is executed |
| 23 | + new Challenge_3().executeAction(new PeterParker(), logan); |
| 24 | + System.out.println(marvelHero + logan.wolverineCloseCount); |
| 25 | + } |
| 26 | + |
| 27 | + private void executeAction( Closeable spiderMan, AutoCloseable wolverine ) throws IOException { |
| 28 | + /** |
| 29 | + * As We can see after the code execution of the try block we close the resources automatically |
| 30 | + * and we jump to the catch block only if some exception has been thrown. |
| 31 | + */ |
| 32 | + try (spiderMan;wolverine){ |
| 33 | + wolverine.close(); |
| 34 | + }catch (Exception e){ |
| 35 | + marvelHero+= "?"; |
| 36 | + spiderMan.close(); |
| 37 | + } |
| 38 | + } |
| 39 | + static class Logan implements AutoCloseable{ |
| 40 | + public static int wolverineCloseCount=0; |
| 41 | + |
| 42 | + @Override |
| 43 | + public void close() throws IOException { |
| 44 | + marvelHero +=">"; |
| 45 | + wolverineCloseCount++; |
| 46 | + if (wolverineCloseCount >= 1) throw new IOException(); |
| 47 | + } |
| 48 | + } |
| 49 | + static class PeterParker implements Closeable{ |
| 50 | + @Override |
| 51 | + public void close() throws IOException { |
| 52 | + marvelHero += "#"; |
| 53 | + } |
| 54 | + } |
| 55 | +} |
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