Java-set Source Code Analysis

Set is also inherited from Collection,set, which is also a collection, and set does not allow duplicate elements to exist.
Set source code:

Public Interfaceset<E>extendscollection<E> {intsize(); //Size    BooleanIsEmpty();//Is empty    Booleancontains(Object o); //Whether an object is included    iterator<E>iterator(); //Generate iterators    Object[]ToArray(); //Returns an object array    <T>T[]ToArray(T[] a); //return generic array    BooleanAdd(EE; //Add elements to set    BooleanRemove(Object o); //Remove an element from the set    BooleanContainsall(collection<?> c); //Whether a collection is included in this LSet    BooleanAddAll(COLLECTION&LT;?extendsE> C); //Append a collection to this set    BooleanRetainall(collection<?> c); //delete elements in a set that do not exist in collection    BooleanRemoveAll(collection<?> c); //Delete the elements contained in this collection    voidClear(); //Empty set    Booleanequals(Object o);//Determine if two sets are the same    inthashcode(); //Calculate set's Hashcode    @Override    defaultspliterator<E>Spliterator() {returnSpliterators.spliterator (This ,SPLITERATOR.DISTINCT);    }}

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Java-set Source Code Analysis