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  1. class Owner<T extends AutoCloseable> implements AutoCloseable {
  2.     private T t;
  3.  
  4.     public Owner(T t) {
  5.         this.t = t;
  6.     }
  7.  
  8.     @Override
  9.     public void close() throws Exception {
  10.         if (t != null) {
  11.             t.close();
  12.             t = null;
  13.         }
  14.     }
  15.  
  16.     public T release() {
  17.         T result = t;
  18.         t = null;
  19.         return result;
  20.     }
  21. }
  22.  
  23. class Bender implements AutoCloseable {
  24.     private final String name;
  25.     private final boolean bad;
  26.  
  27.     public Bender(String name) throws Exception {
  28.         throw new Exception(name + ": bite my shiny metal ass");
  29.     }
  30.  
  31.     public Bender(String name, boolean bad) {
  32.         this.name = name;
  33.         this.bad = bad;
  34.     }
  35.  
  36.     @Override
  37.     public void close() throws Exception {
  38.         if (bad) {
  39.             throw new Exception(name + ": kill all humans");
  40.         } else {
  41.             System.out.println(name + ": all hail to hypnotoad");
  42.         }
  43.     }
  44. }
  45.  
  46. public class Main implements AutoCloseable {
  47.     private Bender first;
  48.     private Bender second;
  49.  
  50.     public Main() throws Exception {
  51.         try (Owner<Bender> first = new Owner<Bender>(new Bender("first", false))) {
  52.             second = new Bender("second");
  53.             this.first = first.release();
  54.         }
  55.     }
  56.  
  57.     public Main(boolean bad) throws Exception {
  58.         try (Owner<Bender> first = new Owner<Bender>(new Bender("first", false))) {
  59.             second = new Bender("second", bad);
  60.             this.first = first.release();
  61.         }
  62.     }
  63.  
  64.     @Override
  65.     public void close() throws Exception {
  66.         try (Bender first = this.first; Bender second = this.second) {
  67.         }
  68.     }
  69.  
  70.     public static void main(String[] args) {
  71.         try (Main twr = new Main()) {
  72.             System.out.println("first test");
  73.         } catch (Exception e) {
  74.             e.printStackTrace(System.out);
  75.         }
  76.         System.out.println();
  77.  
  78.         try (Main twr = new Main(true)) {
  79.             System.out.println("second test");
  80.         } catch (Exception e) {
  81.             e.printStackTrace(System.out);
  82.         }
  83.         System.out.println();
  84.  
  85.         try (Main twr = new Main(false)) {
  86.             System.out.println("third test");
  87.         } catch (Exception e) {
  88.             e.printStackTrace(System.out);
  89.         }
  90.         System.out.println();
  91.     }
  92. }
  93.  
Success #stdin #stdout 0.06s 215552KB
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stdin
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Standard input is empty
stdout
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first: all hail to hypnotoad
java.lang.Exception: second: bite my shiny metal ass
	at Bender.<init>(Main.java:28)
	at Main.<init>(Main.java:52)
	at Main.main(Main.java:71)

second test
first: all hail to hypnotoad
java.lang.Exception: second: kill all humans
	at Bender.close(Main.java:39)
	at Main.close(Main.java:67)
	at Main.main(Main.java:80)

third test
second: all hail to hypnotoad
first: all hail to hypnotoad
https://ideone.com/aPYM0
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

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