package java.util;
import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.checker.nullness.qual.KeyFor;
import org.checkerframework.checker.nullness.qual.Nullable;
// This class allows null elements
public class IdentityHashMap<K extends @Nullable Object, V extends @Nullable Object> extends AbstractMap<K, V> implements Map<K, V>, java.io.Serializable, Cloneable {
private static final long serialVersionUID = 0;
public IdentityHashMap() { throw new RuntimeException("skeleton method"); }
public IdentityHashMap(int a1) { throw new RuntimeException("skeleton method"); }
public IdentityHashMap(Map<? extends K, ? extends V> a1) { throw new RuntimeException("skeleton method"); }
@Pure public int size() { throw new RuntimeException("skeleton method"); }
@Pure public boolean isEmpty() { throw new RuntimeException("skeleton method"); }
@Pure public @Nullable V get(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
@Pure public boolean containsKey(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
@Pure public boolean containsValue(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
public @Nullable V put(K a1, V a2) { throw new RuntimeException("skeleton method"); }
public void putAll(Map<? extends K, ? extends V> a1) { throw new RuntimeException("skeleton method"); }
public @Nullable V remove(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
public void clear() { throw new RuntimeException("skeleton method"); }
@Pure public boolean equals(@Nullable Object a1) { throw new RuntimeException("skeleton method"); }
@Pure public int hashCode() { throw new RuntimeException("skeleton method"); }
@SideEffectFree public Set<@KeyFor("this") K> keySet() { throw new RuntimeException("skeleton method"); }
@SideEffectFree public Collection<V> values() { throw new RuntimeException("skeleton method"); }
@SideEffectFree public Set<Map.Entry<@KeyFor("this") K, V>> entrySet() { throw new RuntimeException("skeleton method"); }
@SideEffectFree public Object clone() { throw new RuntimeException("skeleton method"); }
}