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| public class Clown {} |
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| // run as 'java -Djava.security.manager Main' | |
| public class Main { | |
| private static class RecursiveClown extends Clown { | |
| private final Volkswagen vw; | |
| private final int amount; | |
| public RecursiveClown(int amount, Volkswagen vw) { | |
| this.vw = vw; | |
| this.amount = amount; | |
| } | |
| @Override | |
| public int hashCode() { | |
| if (amount > 1) { | |
| vw.add(new RecursiveClown(amount - 1, vw)); | |
| } | |
| return super.hashCode(); | |
| } | |
| } | |
| public static void main(String[] args) { | |
| Volkswagen vw = new Volkswagen(); | |
| vw.add(new RecursiveClown(20, vw)).done(); | |
| } | |
| } |
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| import java.util.HashSet; | |
| import java.util.Set; | |
| public final class Volkswagen { | |
| private static final int CAPACITY = 5; | |
| private final Set<Clown> clowns = new HashSet<>(); | |
| public Volkswagen add(Clown clown) { | |
| synchronized(this) { | |
| if (clowns.size() >= CAPACITY) { | |
| throw new IllegalStateException("I'm full"); | |
| } else { | |
| clowns.add(clown); | |
| } | |
| return this; | |
| } | |
| } | |
| public Volkswagen done() { | |
| synchronized(this) { | |
| if (clowns.size() == 20) { | |
| System.out.println("I'm a Volkswagen with 20 clowns!"); | |
| } else { | |
| System.out.println("Way to much space in here!"); | |
| } | |
| return this; | |
| } | |
| } | |
| } |
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