The entrySet() in Hashmap is used to get the mapping of the hashmap in a set view.

Method signature:

The signature for entrySet() is shown below:

public Set<Map.Entry<K,V>> entrySet()

Methods parameters and return type:

Parameter: It doesn’t take any parameters.

Return type: It returns a copy of a Hashmap.

Throws: N/A.

Hashmap entrySet() Example:

In this example, we have displayed a set view of a hashmap.

Source code:

public class Example1 {

    public static void main(String args[]) {

        HashMap map = new HashMap();

        map.put(1, "This");
        map.put(2, "is");
        map.put(3, "a java");
        map.put(4, "tutorial");
        
        Set set = map.entrySet();

        System.out.println("In a set form: " + set);
    }
}

Output:

run:
In a set form: [1=This, 2=is, 3=a java, 4=tutorial]
BUILD SUCCESSFUL (total time: 0 seconds)

Example 2:

In this example, we have mapped integer values on a Hashmap. In the end, we have displayed the initial values and set form of the mapping.

Source code:

public class Example2 {
    
    public static void main(String[] args)
    {
  
        HashMap<String, Integer> map = new HashMap<>();
  
        map.put("a", 22);
        map.put("b", 11);
        map.put("c", 20);
        map.put("d", 90);
        map.put("e", 23);
  
        System.out.println("Initial values: " + map);
  
        System.out.println("The set form: " + map.entrySet());
    }
}

Output:

run:
Initial values: {a=22, b=11, c=20, d=90, e=23}
The set form: [a=22, b=11, c=20, d=90, e=23]
BUILD SUCCESSFUL (total time: 1 second)

References:

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