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1) hashtable is synchronized , hashmap is not
2) hashtable is slow , hashmap is fast
3) hashtable is old and hashmap is new
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∙ 12y ago
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Which all represent the properties of hashtable in java?
HashTableLike Vector, Hashtable has existed from prehistoric Java times. For fun, don't forget to note the naming inconsistency: HashMap vs. Hashtable. Where's the capitalization of t? Oh well, you won't be expected to spell it. Anyway, just as Vector is a synchronized counterpart to the sleeker, more modern ArrayList, Hashtable is the synchronized counterpart to HashMap. Remember that you don't synchronize a class, so when we say that Vector and Hashtable are synchronized, we just mean that the key methods of the class are synchronized. Another difference, though, is that while HashMap lets you have null values as well as one null key, a Hashtable doesn't let you have anything that's null.
What is the difference between LinkedList and Hashtable?
A linked list is made up of a sequence of connected (linked) nodes. A hashtable is usually backed by an array, and is an association of keys and values. When an object is added to the array it becomes a value; the object is hashed to get a key (an index into the array).
Hash table in java?
HashMapThe HashMap gives you an unsorted, unordered Map. When you need a Map and you don't care about the order (when you iterate through it), then HashMap is the way to go; the other maps add a little more overhead. Where the keys land in the Map is based on the key's hashcode, so, like HashSet, the more efficient your hashCode() implementation, the better access performance you'll get. HashMap allows one null key and multiple null values in a collection.HashTableLike Vector, Hashtable has existed from prehistoric Java times. For fun, don't forget to note the naming inconsistency: HashMap vs. Hashtable. Where's the capitalization of t? Oh well, you won't be expected to spell it. Anyway, just as Vector is a synchronized counterpart to the sleeker, more modern ArrayList, Hashtable is the synchronized counterpart to HashMap. Remember that you don't synchronize a class, so when we say that Vector and Hashtable are synchronized, we just mean that the key methods of the class are synchronized. Another difference, though, is that while HashMap lets you have null values as well as one null key, a Hashtable doesn't let you have anything that's null.
Is the hashmap commonly used in Java?
Absolutely. The hashmap is used quite a bit in java scripting as it is important in making many things in Java work. It's difficult to learn, but handy to know about.
What is HashMap Java used for?
HashMap Java is used as a definition in Java software programming language. This version of Java is used to tag objects using hash numbers and therefore differentiate different items in different databases.
How does the load factor affect java hashmap?
The load factor affects Java HashMap by slowing it down because of the big load. The program doesn't work at it's full capacity, and does not preform very well.
What are the advantages of using a Java Hashmap?
One of the advantages to using a Java Hashmap is that it allows one to use null values in it. Another advantage is its speed by splitting data into many 'buckets' and reducing the length of search times.
What is a java hashmap used for?
Unfortunately you cannot save a HashMap object by means of only using core functionality in Java. The good thing is that you have, by all means, can use a Database software to do the job, move the objects and map them to a table.
Where can one find information on hashmap?
One can find all the official documentation for HashMap, as well as a download for it, at the official Oracle site. Some sites that have good information on using HashMap include Java Revisited and Tutorials Point.
What are the methods of hash table?
See the related link below for the Java API documentation for the Hashtable class and its methods.
Can you name the legacy classes and interface for collections?
Dictionary, Hashtable ,Properties ,Stack and vector are the legacy classes in java
Where is it possible to get a Java iterator?
The Oracle website has a step by step pattern that shows how to obtain an iterator for use with Java programming. HashMap can also be helpful with explaining the looping sequence.
