The java.util.IdentityHashMap.equals() method in Java is used to check for equality between two maps. It verifies whether the elements of one map passed as a parameter is equal to the elements of this map or not.
Syntax:
ihashmap1.equals(ihashmap2)
Parameters: The method accepts one parameter ihashmap2 of identity hash map type and refers to the map whose equality is to be checked with this hash map.
Return Value: The method returns true if the equality holds for both the object map else it returns false.
Below programs illustrate the working of java.util.IdentityHashMap.equals() method:
Program 1:
// Java code to illustrate the equals() method import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<Integer, String> identity_hash1 =
new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> identity_hash2 =
new IdentityHashMap<Integer, String>();
// Mapping string values to int keys
identity_hash1.put( 10 , "Geeks" );
identity_hash1.put( 15 , "4" );
identity_hash1.put( 20 , "Geeks" );
identity_hash1.put( 25 , "Welcomes" );
identity_hash1.put( 30 , "You" );
// Mapping string values to int keys
identity_hash2.put( 10 , "Geeks" );
identity_hash2.put( 15 , "4" );
identity_hash2.put( 20 , "Geeks" );
identity_hash2.put( 25 , "Welcomes" );
identity_hash2.put( 30 , "You" );
// Displaying the IdentityHashMap
System.out.println( "First Map: "
+ identity_hash1);
// Displaying the final IdentityHashMap
System.out.println( "Second Map: "
+ identity_hash2);
// Displaying the equality
System.out.println( "Equality: " +
identity_hash1.equals(identity_hash2));
}
} |
First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4} Second Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4} Equality: true
Program 2:
// Java code to illustrate the equals() method import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<Integer, String> identity_hash1 =
new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> identity_hash2 =
new IdentityHashMap<Integer, String>();
// Mapping string values to int keys
identity_hash1.put( 10 , "Geeks" );
identity_hash1.put( 15 , "4" );
identity_hash1.put( 20 , "Geeks" );
identity_hash1.put( 25 , "Welcomes" );
identity_hash1.put( 30 , "You" );
// Mapping string values to int keys
identity_hash2.put( 10 , "Geeks" );
identity_hash2.put( 15 , "4" );
identity_hash2.put( 20 , "Geek" );
identity_hash2.put( 25 , "Welcomes" );
identity_hash2.put( 30 , "You" );
// Displaying the IdentityHashMap
System.out.println( "First Map: "
+ identity_hash1);
// Displaying the final IdentityHashMap
System.out.println( "Second Map: "
+ identity_hash2);
// Displaying the equality
System.out.println( "Equality: " +
identity_hash1.equals(identity_hash2));
}
} |
First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4} Second Map: {10=Geeks, 30=You, 20=Geek, 25=Welcomes, 15=4} Equality: false