↳ java.util.AbstractCollection<E>↳ java.util.AbstractSet<E>↳ java.util.HashSet<E>publicclassHashSet<E>extendsAbstractSet<E>implementsSet<E>, Cloneable, java.io.Serializable { } 3、HashSet源码分析 3.1、属性 staticfinallongserialVersionUID = -5024744406713321676L;//序列化IDprivatetransientHa...
implementsSet<E>, Cloneable, java.io.Serializable { //... privatetransientHashMap<E,Object> map; privatestaticfinalObjectPRESENT=newObject(); privatevoidreadObject(java.io.ObjectInputStream s) throwsjava.io.IOException, ClassNotFoundException { // Read in any hidden serialization magic // 读取流...
六、HashSet遍历 在HashSet的源码中找了一通,然并没有找到get方法,那么我们将如何获取元素呢?我发现了iterator接口,这个接口返回的Iterator并不是HashSet自己维护的Iterator,而是通过返回HashMap的keySet().Iterator,这个迭代器遍历的是HashMap的key值。也就是HashSet中保存的value。 源码: 1 public Iterator<E> ite...
HashCode() is explicitly used in methods where hash functions are used, like hashTable() etc. One should always override hashCode() when overriding equals(). Unexpected behaviour will occur if you don't do so. HashCode() should have the same value whenever equals() returns true. Java中的集...
java中HashSet有什么用,举例说明 2.1 HashSet的用法 对象也必须定义hashCode(),比如下面例子2.1.1中的String类中就定义了hashCode方法。 h.add("1"); 但随着Set的增大,它的性能不会大打折扣。这是由Hash的低层结构决定的。HashSet不保证输出的顺序。
util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; public class MostCommonElementInHashSet { public static void main(String[] args) { HashSet<String> set = new HashSet<>(); set.add("apple"); set.add("banana"); set.add("apple"); set.add("...
finalize,getClass,notify,notifyAll,wait,wait,wait Methods inherited from interface java.util.Set addAll,containsAll,equals,hashCode,removeAll,retainAll,toArray,toArray Methods inherited from interface java.util.Collection parallelStream,removeIf,stream ...
GetHashCode() Returns a hash code value for the object. (Inherited from Object) Iterator() Returns an iterator over the elements in this set. JavaFinalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (...
Namespace: Java.Util Assembly: Mono.Android.dll Returns an iterator over the elements in this set. C# 複製 [Android.Runtime.Register("iterator", "()Ljava/util/Iterator;", "GetIteratorHandler")] public override Java.Util.IIterator Iterator (); Returns IIterator an Iterator over the el...
HashSet 存储的元素对应 HashMap 的 key,因为 HashMap 不能存储重复的 key,所以 HashSet 不能存放重复元素;由于HashMap 的 key 是基于 hashCode 存储对象的,所以 HashSet 中存放的对象也是无序的;HashSet 也没有提供 get 方法,可以通过 Iterator 迭代器获取数据。