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I have been trying to simply get a name for what the <> part of the declaration is called, to no luck. Can anyone tell me what it's called, how I can use it in my own class? For instance I may want to try and make my own kind of collection, and use new MyThing<String> for instance. Any help is appreciated, thanks!
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Type Parameters: K - the type of keys maintained by this map V - the type of mapped values All Implemented Interfaces: Serializable, Cloneable, Map<K,V> Direct Known Subclasses: LinkedHashMap, PrinterStateReasons.
HashMap stores key, value pairs and it does not allow duplicate keys. If the key is duplicate then the old key is replaced with the new value.
How To Find Duplicate Elements In Array In Java Using HashMap? In this method, We use HashMap to find duplicates in array in java. We store the elements of input array as keys of the HashMap and their occurrences as values of the HashMap. If the value of any key is more than one (>1) then that key is duplicate element.
You can use the “values()” and “keySet()” methods to print the values and keys of HashMap separately. The values() method returns the entire set of values, whereas the keySet() method returns the entire set of HashMap keys.
That's the generic type declaration of the class. For example, to specify that a map is going to use strings as keys and integers as values:
Map<String, Integer> mymap = new HashMap<String, Integer>();
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