The syntax of the entrySet() method is:
hashmap.entrySet()
Here, hashmap is an object of the HashMap class.
entrySet() Parameters
The entrySet() method does not take any parameter.
entrySet() Return Value
- returns a set view of all the entries of a hashmap
Note: The set view means all entries of the hashmap are viewed as a set. Entries are not converted to a set.
Example 1: Java HashMap entrySet()
Output
HashMap: {Pant=150, Bag=300, Shoes=200}
Set View: [Pant=150, Bag=300, Shoes=200]
In the above example, we have created a hashmap named prices. Notice the expression,
prices.entrySet()
Here, the entrySet() method returns a set view of all the entries from the hashmap.
The entrySet() method can be used with the for-each loop to iterate through each entry of the hashmap.
Example 2: entrySet() Method in for-each Loop
Output
HashMap: {One=1, Two=2, Three=3}
Entries: One=1, Two=2, Three=3,
In the above example, we have imported the java.util.Map.Entry package. The Map.Entry is the nested class of the Map interface. Notice the line,
Entry<String, Integer> entry : numbers.entrySet()
Here, the entrySet() method returns a set view of all the entries. The Entry class allows us to store and print each entry from the view.
Recommended Reading
- HashMap keySet() - returns set view of all keys
- HashMap values() - returns set view of all values