Last Updated : 23 Jul, 2018
The java.util.IdentityHashMap.entrySet() method in Java is used to create a set out of the same elements contained in the map. It basically returns a set view of the identity hash map or we can create a new set and store the map elements into them.
Syntax:Identity_HashMap.entrySet()Parameters:
The method does not take any parameter.
Return Value:The method returns a set having same elements as the map. Below programs illustrate the java.util.IdentityHashMap.entrySet() Method:
Program 1:Mapping String Values to Integer Keys.
Java
// Java code to illustrate the entrySet() method
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<Integer, String> identity_hash =
new IdentityHashMap<Integer, String>();
// Mapping string values to int keys
identity_hash.put(10, "Geeks");
identity_hash.put(15, "4");
identity_hash.put(20, "Geeks");
identity_hash.put(25, "Welcomes");
identity_hash.put(30, "You");
// Displaying the IdentityHashMap
System.out.println("Initial Mappings are: " +
identity_hash);
// Using entrySet() to get the set view
System.out.println("The set is: " +
identity_hash.entrySet());
}
}
Output:
Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The set is: [10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4]
Program 2:
Mapping Integer Values to String Keys.
Java
// Java code to illustrate the entrySet() method
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<String, Integer> identity_hash =
new IdentityHashMap<String, Integer>();
// Mapping int values to string keys
identity_hash.put("Geeks", 10);
identity_hash.put("4", 15);
identity_hash.put("Geeks", 20);
identity_hash.put("Welcomes", 25);
identity_hash.put("You", 30);
// Displaying the IdentityHashMap
System.out.println("Initial Mappings are: " +
identity_hash);
// Using entrySet() to get the set view
System.out.println("The set is: " +
identity_hash.entrySet());
}
}
Output:
Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The set is: [Geeks=20, Welcomes=25, You=30, 4=15]
Note:
The same operation can be performed with any type of Mappings with variation and combination of different data types.
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