Class Hashtable

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Iterable<Hashtable.Entry>

    public class Hashtable
    extends java.lang.Object
    implements java.io.Serializable, java.lang.Iterable<Hashtable.Entry>
    This generic hash table class is used by Set and Map. It uses a standard HashMap for storing keys and values so that we can handle lots of hash collisions if necessary, and a doubly-linked list to support the iterator capability.

    This second one is important because JavaScript handling of the iterator is completely different from the way that Java does it. In Java an attempt to modify a collection on a HashMap or LinkedHashMap while iterating through it (except by using the "remove" method on the Iterator object itself) results in a ConcurrentModificationException. JavaScript Maps and Sets explicitly allow the collection to be modified, or even cleared completely, while iterators exist, and even lets an iterator keep on iterating on a collection that was empty when it was created..

    See Also:
    Serialized Form
    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  Hashtable.Entry
      One entry in the hash table.
    • Constructor Summary

      Constructors 
      Constructor Description
      Hashtable()  
    • Method Summary

      All Methods Instance Methods Concrete Methods Deprecated Methods 
      Modifier and Type Method Description
      void clear()  
      java.lang.Object delete​(java.lang.Object key)
      Deprecated.
      use deleteEntry(Object key) instead because this returns null if the entry was not found or the value of the entry is null
      boolean deleteEntry​(java.lang.Object key)  
      java.lang.Object get​(java.lang.Object key)
      Deprecated.
      use getEntry(Object key) instead because this returns null if the entry was not found or the value of the entry is null
      Hashtable.Entry getEntry​(java.lang.Object key)  
      boolean has​(java.lang.Object key)  
      java.util.Iterator<Hashtable.Entry> iterator()  
      void put​(java.lang.Object key, java.lang.Object value)  
      int size()  
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
      • Methods inherited from interface java.lang.Iterable

        forEach, spliterator
    • Constructor Detail

      • Hashtable

        public Hashtable()
    • Method Detail

      • size

        public int size()
      • put

        public void put​(java.lang.Object key,
                        java.lang.Object value)
      • get

        public java.lang.Object get​(java.lang.Object key)
        Deprecated.
        use getEntry(Object key) instead because this returns null if the entry was not found or the value of the entry is null
      • has

        public boolean has​(java.lang.Object key)
      • delete

        public java.lang.Object delete​(java.lang.Object key)
        Deprecated.
        use deleteEntry(Object key) instead because this returns null if the entry was not found or the value of the entry is null
      • deleteEntry

        public boolean deleteEntry​(java.lang.Object key)
      • clear

        public void clear()