Java HashMap Constructors | Java HashMap (Java Tutorial) смотреть онлайн

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******************** Java HashMap Properties:
It implements the map interface.
It extends AbstractMap class.
HashMap contains values based on the key.
Contains only unique elements.
May have one null key and multiple null values.
Maintains no order.

Java HashMap Constructors:
HashMap() - It is the default constructor. It creates an empty HashMap object.
HashMap(Map existingMap) - It creates a HashMap object bu using the key/value pairs present from the existingMap.
HashMap(Integer capacity) - It creates a HashMap object using the initial capacity.
HashMap(Integer capacity, Integer fillratio) - It creates a HashMap object using the initial capacity and fill ratio.

Java HashMap Methods:
void clear() - It removes all the key/value pairs from the target map.
boolean containsKey(Object targetKey) - It returns true if the targetKey is present in the map else false.
boolean containsValue(Object targetValue) - It returns true if the targeValue is present in the map else false.
boolean isEmpty() - It returns true if the map doesn't contain any key/value pairs
int size() - It returns the total key/value pairs count.


For more details & source code check out: https://programmingline.com/2017/12/what-is-hashmap.html

#javahashmap #javacollections #programmingline #rakesh #rake

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