package java.util;
import checkers.nullness.quals.*;
@checkers.quals.DefaultQualifier("checkers.nullness.quals.NonNull")
public class HashSet<E extends @Nullable Object> extends AbstractSet<E> implements Set<E>, Cloneable, java.io.Serializable {
private static final long serialVersionUID = 0;
public HashSet() { throw new RuntimeException("skeleton method"); }
public HashSet(Collection<? extends E> a1) { throw new RuntimeException("skeleton method"); }
public HashSet(int a1, float a2) { throw new RuntimeException("skeleton method"); }
public HashSet(int a1) { throw new RuntimeException("skeleton method"); }
public Iterator<E> iterator() { throw new RuntimeException("skeleton method"); }
public int size() { throw new RuntimeException("skeleton method"); }
public boolean isEmpty() { throw new RuntimeException("skeleton method"); }
public boolean contains(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
public boolean add(E a1) { throw new RuntimeException("skeleton method"); }
public boolean remove(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
public void clear() { throw new RuntimeException("skeleton method"); }
public Object clone() { throw new RuntimeException("skeleton method"); }
}