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What is HashMap

9/17/2016 10:01:04 PM

violet

3 Answers

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In a Hashtable, instead of accessing elements with an index number (like in arrays for example), you access them with their key (which can be a number, a string, etc.). For example, here we create a new Hashtable dictionary, insert the key/value pair "blanc"/"white", and display the item with key "blanc": Hashtable dictionary = new Hashtable(); dictionary.put("blanc", "white"); System.out.println(dictionary.get("blanc")); A HashMap is almost like a Hashtable, the only differences being that it accepts null as value or key, and it is not thread-safe.

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just like an ArrayList but instead of indexing elements using Integers , You can use e.g Strings or other types ... e.g. HashMap hm=new HashMap<String,String>();

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Hashtable? What's that?