1/23/2024 0 Comments Java hash table![]() ![]() Let's consider an example program to illustrate methods of Hashtable class. It is used to compare the specified Object with the Hashtable. It maintains an array of SequentialSearchST objects and implements get() and put() by computing a hash function to choose which SequentialSearchST can contain the key and then using get() and put() from SequentialSearchST to complete either job. It is used to remove all the lements of a Hashtable. Program SeparateChainingHashST.java implements a symbol table with a separate-chaining hash table. It returns the total number of elements in the Hashtable. It returns true if Hashtable has no elements otherwise returns false. It performs the given action for each entry in the map until all entries have been processed or the action throws an exception. If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value. ![]() V merge(K key, V value, BiFunction remappingFunction) It returns a string representation of the Hashtable object. ![]() It is used to increase the size of the hash table and rehashes all of its keys. It replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception. It replaces the old value with the new value for a specified key. It replaces the specified value for a specified key.īoolean replace(K key, V oldValue, V newValue) Lets add a growing functionality to the program that doubles the size of the internal array of the hash. The greatest fault in the functionality is that the size of the internal array is not increased when the number of values grows too large. It returns true if the specified key found within the hash table, else return false. The way of adding to a hash table that was described above works partly. It returns true if the specified value found within the hash table, else return false. It removes the specified values with the associated specified keys from the hashtable. It returns the value associated with given key and removes the same. It returns a shallow copy of the Hashtable. It returns the hash code of the hashtable. It returns a set view of the mappings contained in the hashtable. Returns an enumeration of the values of the hashtable. Like HashMap, Hashtable stores key/value pairs in a hash table. It returns a collection view of the values contained in the Hashtable. Returns a set view of the keys of the hashtable. Returns an enumeration of the keys of the hashtable. It returns the value associated with the given key. It returns the value associated with given key or defaultValue if the hashtable contains no mapping for the key. V getOrDefault(Object key, V defaultValue) If the specified key is not already associated with a value associates it with the given value and returns null, else returns the current value. It inserts all the elements of Map m into the invoking Hashtable. It inserts the specified key and value into the hash table. ![]()
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