示例#1
0
  /**
   * Returns a new {@code Hashtable} with the same key/value pairs, capacity and load factor.
   *
   * @return a shallow copy of this {@code Hashtable}.
   * @see java.lang.Cloneable
   */
  @SuppressWarnings("unchecked")
  @Override
  public synchronized Object clone() {
    /*
     * This could be made more efficient. It unnecessarily hashes all of
     * the elements in the map.
     */
    Hashtable<K, V> result;
    try {
      result = (Hashtable<K, V>) super.clone();
    } catch (CloneNotSupportedException e) {
      throw new AssertionError(e);
    }

    // Restore clone to empty state, retaining our capacity and threshold
    result.makeTable(table.length);
    result.size = 0;
    result.keySet = null;
    result.entrySet = null;
    result.values = null;

    result.constructorPutAll(this);
    return result;
  }
示例#2
0
 /**
  * Constructs a new instance of {@code Hashtable} containing the mappings from the specified map.
  *
  * @param map the mappings to add.
  */
 public Hashtable(Map<? extends K, ? extends V> map) {
   this(capacityForInitSize(map.size()));
   constructorPutAll(map);
 }