public class HashSet<E> extends AbstractSet<E> implements Set<E>, Cloneable, java.io.Serializable { static final long serialVersionUID = -5024744406713321676L; private transient HashMap<E,Object> map; private static final Object PRESENT = new Object(); public HashSet() { map = new HashMap<...
u Set – 对象之间没有指定的顺序,不允许重复元素 u List– 对象之间有指定的顺序,允许重复元素,并引入位置下标。 u Map – 接口用于保存关键字(Key)和数值(Value)的集合,集合中的每个对象加入时都提供数值和关键字。Map 接口既不继承 Set 也不继承 Collection。 List、Set、Map共同的实现基础是Object数组 除了...
known as its elements. Some collections allow duplicate elements and others do not. Some are ordered and others unordered. The JDK does not provide any direct implementations of this interface: it provides implementations of more specific subinterfaces like Set and List. This interface is typically...
3.5. HashSet类类和TreeSet类 “集合框架”支持Set接口两种普通的实现:HashSet和TreeSet(TreeSet实现SortedSet接口)。在更多情况下,您会使用 HashSet 存储重复自由的集合。考虑到效率,添加到 HashSet 的对象需要采用恰当分配哈希码的方式来实现hashCode()方法。虽然大多数系统类覆盖了 Object中缺省的hashCode()和equal...
A structural modification is any operation that adds or deletes one or more mappings or, in the case of access-ordered linked hash maps, affects iteration order. In insertion-ordered linked hash maps, merely changing the value associated with a key that is already contained in the map is not...
affects iteration order. In insertion-ordered linked hash maps, merely changing the value associated with a key that is already contained in the map is not a structural modification. In access-ordered linked hash maps, merely querying the map withgetis a structural modification. ) The iterators...
which is the order in which elements were inserted into the set (insertion-order). Note that insertion order isnotaffected if an element isre-insertedinto the set. (An elementeis reinserted into a setsifs.add(e)is invoked whens.contains(e)would returntrueimmediately prior to the invocation...
Returns a reverse-ordered view of this collection. (Inherited from ISequencedCollection) SetJniIdentityHashCode(Int32) Set the value returned by JniIdentityHashCode. (Inherited from IJavaPeerable) SetJniManagedPeerState(JniManagedPeerStates) (Inherited from IJavaPeerable) SetPeerReference(...
in the case of access-ordered linked hash maps, affects iteration order. In insertion-ordered linked hash maps, merely changing the value associated with a key that is already contained in the map is not a structural modification.In access-ordered linked hash maps, merely querying the map with...
SetType org.hibernate.type.OrderedSetType org.hibernate.type.SortedSetType org.hibernate.type.ComponentType (implements org.hibernate.type.CompositeType, org.hibernate.type.ProcedureParameterExtractionAware<T>) org.hibernate.type.EmbeddedComponentType org.hibernate.type.CompositeCustomType (implements ...