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Hashtable contains: {3=Three, 2=Two, 1=Ten}, Original hashtable: {3=Three, 2=Two, 1=One}, Cloned hashtable: {3=Three, 2=Two, 1=One}, //this will create mapping 1=>One and return null, //this will replace "One" with "Two" for key 1 and return "One", //this will return "One" but will not replace the value, //this will copy all mappings from hashmap to hashtable, //this will return "Two" i.e. Then using this enumeration, we print the key-value pairs from the HashTable. A Hashtable is the array of a list. If you like my website, follow me on Facebook and Twitter. If the key was not found, it returns null. In this program, we define a hashtable with the keys as the account holder names with their respective account balances as values. It is necessary for anyone to be clear with the working of a hash table before moving on to the implementation aspect. The below given are some of the important methods of the Hashtable class in Java. Any changes you make to this set will be reflected in the original hashtable object, and vice versa. HashMap, the Hashtable is synchronized. The clone method of the Hashtable class returns a shallow copy of this hashtable object. Java Hashtable tutorial with examples will help you understand how to use Java Hashtable in an easy way. The Hashtable containsValue method is similar to the contains method in functionality. The Hashtable class is contained in the java.util package. The returned Collection is a view that is backed by the original Hashtable object. import java.util. And you are using “” but not null. This is a relatively expensive operation. The Hashtable keys method returns an enumeration of the keys contained in this hashtable object. The Hashtable size method returns the number of entries stored in the hashtable object. 5) Enumeration keys(): Returns an enumeration of the keys contained in the hash table. Unless otherwise mentioned, all Java examples are tested on Java 6, Java 7 and Java 8 versions. If the Hashtable key is an object of a custom class, then the custom class needs to override the equals and hashCode methods for the containsKey method to work properly. If you want to replace the value if and only if the specified key is mapped to the specified value, you can use below given overloaded replace method. Please let me know if you liked the Java Hashtable tutorial with examples in the comments section below. So, any changes you make to the entry set will be reflected in the original hashtable object, and vice versa. The default Hashtable constructor creates a new and empty hashtable object. The above given remove method removes the key-value mapping from the hashtable if the specified key is mapped to any value in the hash table object. References: Java 8 Hashtable Documentation. Sitemap. Hashtable in Java is an implementation of the Map interface. If the key is not mapped to the specified old value, or if the key does not exist, it returns false. HashTable in Java Example | Java HashTable Tutorial HashTable in Java. This operation is more expensive than the containsKey method. Hashtable in Java is an implementation of the Map interface. Your email address will not be published. Required fields are marked *. Over the years I have worked with many fortune 500 companies as an eCommerce Architect. Convert ArrayList to LinkedHashSet in Java Example, Check If LinkedHashMap Contains Key in Java Example, Convert TreeSet to ArrayList (List, LinkedList) in Java Example, Convert LinkedHashSet to Array in Java Example, Iterate Vector in Reverse Direction in Java Example, Check If Element Exists in LinkedHashSet in Java Example, Java ArrayList insert element at beginning example, Java ArrayList remove last element example. The remove method returns the value associated with the key if the key was found and removed from the hashtable. Hope it helps you. That means that the elements may not be returned in the same order in which they were inserted into the hashtable. The contains method was part of the original Java Hashtable class, but when it was rewritten to implement the Map interface in Java 2, the Hashtable class was required to define the containsValue method. It returns zero if the hashtable is empty. The Hashtable values method returns a Collection view of all values contained in this hashtable object.

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