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public class BrokenEncapsulationTest {
 
  @Test
  public void testAddCount() {
    InstrumentedHashSet<String> set = new InstrumentedHashSet<String>();
 
    set.addAll(Arrays.asList("Snap", "Crackle", "Pop"));
 
    assertEquals(3, set.addCount);
  }
 
  public static class InstrumentedHashSet<E> extends HashSet<E> {
 
    public int addCount = 0;
 
    @Override
    public boolean add(E a) {
      addCount += 1;
      return super.add(a);
    };
 
    @Override
    public boolean addAll(Collection<? extends E> c) {
      addCount += c.size();
      return super.addAll(c);
    }
  }
}
 

Main.java:1: error: class BrokenEncapsulationTest is public, should be declared in a file named BrokenEncapsulationTest.java
public class BrokenEncapsulationTest {
       ^
Main.java:12: error: cannot find symbol
  public static class InstrumentedHashSet<E> extends HashSet<E> {
                                                     ^
  symbol:   class HashSet
  location: class BrokenEncapsulationTest
Main.java:23: error: cannot find symbol
    public boolean addAll(Collection<? extends E> c) {
                          ^
  symbol:   class Collection
  location: class InstrumentedHashSet<E>
  where E is a type-variable:
    E extends Object declared in class InstrumentedHashSet
Main.java:3: error: cannot find symbol
  @Test
   ^
  symbol:   class Test
  location: class BrokenEncapsulationTest
Main.java:7: error: cannot find symbol
    set.addAll(Arrays.asList("Snap", "Crackle", "Pop"));
               ^
  symbol:   variable Arrays
  location: class BrokenEncapsulationTest
Main.java:9: error: cannot find symbol
    assertEquals(3, set.addCount);
    ^
  symbol:   method assertEquals(int,int)
  location: class BrokenEncapsulationTest
Main.java:19: error: non-static variable super cannot be referenced from a static context
      return super.add(a);
             ^
Main.java:19: error: cannot find symbol
      return super.add(a);
                  ^
  symbol: method add(E)
  where E is a type-variable:
    E extends Object declared in class InstrumentedHashSet
Main.java:16: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:25: error: non-static variable super cannot be referenced from a static context
      return super.addAll(c);
             ^
Main.java:22: error: method does not override or implement a method from a supertype
    @Override
    ^
11 errors

Standard output is empty