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() methodimport 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));    }} |
Output:
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() methodimport 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));    }} |
Output:
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
