package java.util;
import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.checker.nullness.qual.PolyNull;
// doesn't permit null element
public class PriorityQueue<E extends @NonNull Object> extends AbstractQueue<E> implements java.io.Serializable {
private static final long serialVersionUID = 0;
public PriorityQueue() { throw new RuntimeException("skeleton method"); }
public PriorityQueue(int a1) { throw new RuntimeException("skeleton method"); }
public PriorityQueue(int a1, Comparator<? super E> a2) { throw new RuntimeException("skeleton method"); }
public PriorityQueue(Collection<? extends E> a1) { throw new RuntimeException("skeleton method"); }
public PriorityQueue(PriorityQueue<? extends E> a1) { throw new RuntimeException("skeleton method"); }
public PriorityQueue(SortedSet<? extends E> a1) { throw new RuntimeException("skeleton method"); }
public boolean add(E a1) { throw new RuntimeException("skeleton method"); }
public boolean offer(E a1) { throw new RuntimeException("skeleton method"); }
public @Nullable E peek() { throw new RuntimeException("skeleton method"); }
public boolean remove(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
@Pure public boolean contains(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
public Object [] toArray() { throw new RuntimeException("skeleton method"); }
public <T> @Nullable T @PolyNull [] toArray(T @PolyNull [] a1) { throw new RuntimeException("skeleton method"); }
public Iterator<E> iterator() { throw new RuntimeException("skeleton method"); }
@Pure public int size() { throw new RuntimeException("skeleton method"); }
public void clear() { throw new RuntimeException("skeleton method"); }
public @Nullable E poll() { throw new RuntimeException("skeleton method"); }
@SideEffectFree public Comparator<? super E> comparator() { throw new RuntimeException("skeleton method"); }
@EnsuresNonNullIf(expression={"poll()", "peek()"}, result=false)
@Pure public boolean isEmpty() { throw new RuntimeException("skeleton method"); }
}