How to create a multikey map in Java?
Java Map has a key value pair where the key must be a unique Object which used to store and retrieve value Object. But we want more than two keys then we can use apache commons-collections.
How to create a map holding any type of value?
Basically I want MyClass that holds a Hashmap that maps Field name (string) to ANY type of Value.. For this purpose I wrote a separate MyField class that holds the type & value information..
How to create a flat map in Java?
Effects: Constructs an empty flat_map using the specified comparison object and inserts elements from the ordered range [first ,last). This function is more efficient than the normal range creation for ordered ranges. Requires: [first ,last) must be ordered according to the predicate. Complexity: Linear in N. Note: Non-standard extension.
What’s the difference between map and multimap in STL?
Multimap in C++ Standard Template Library (STL) Multimap is similar to map with an addition that multiple elements can have same keys. Rather than each element being unique, the key value and mapped value pair has to be unique in this case.
How to create a multikey map in Apache Commons?
Constructor that decorates the specified map and is called from multiKeyMap (AbstractHashedMap). Check to ensure that input keys are valid MultiKey objects. Clones the map without cloning the keys or values. Checks whether the map contains the specified multi-key. Checks whether the map contains the specified multi-key.
How to check if a key is a multikey object?
Check to ensure that input keys are valid MultiKey objects. Clones the map without cloning the keys or values. Puts the key and value into the map, where the key must be a non-null MultiKey object. Copies all of the keys and values from the specified map to this map. Each key must be non-null and a MultiKey object.
Which is the best class for multikeymap in Apache?
public class MultiKeyMap extends AbstractMapDecorator < MultiKey ,V> implements Serializable, Cloneable A Map implementation that uses multiple keys to map the value. This class is the most efficient way to uses multiple keys to map to a value. The best way to use this class is via the additional map-style methods.