Java IdentityHashMap - equals() Method
The java.util.IdentityHashMap.equals() method is used to compare the specified object with this map for equality. The method returns true if the given object is also a map and the two maps represent identical object-reference mappings.
Syntax
public boolean equals(Object obj)
Parameters
obj |
Specify the object to be compared for equality with this map. |
Return Value
Returns true if the specified object is equal to this map.
Exception
NA
Example:
In the example below, the java.util.IdentityHashMap.equals() method is used to compare the specified Object with the given identity hash map.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating identity hash maps
IdentityHashMap<Integer, String> Map1 = new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> Map2 = new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> Map3 = new IdentityHashMap<Integer, String>();
//populating Map1
Map1.put(101, "John");
Map1.put(102, "Marry");
Map1.put(103, "Kim");
//populating Map2
Map2.put(101, "John");
Map2.put(102, "Marry");
Map2.put(103, "Kim");
//populating Map3
Map3.put(1, "JAN");
Map3.put(2, "FEB");
Map3.put(3, "MAR");
//checking Map1 and Map2 for equality
System.out.print("Are Map1 and Map2 equal? : ");
System.out.println(Map1.equals(Map2));
//checking Map1 and Map3 for equality
System.out.print("Are Map1 and Map3 equal? : ");
System.out.println(Map1.equals(Map3));
}
}
The output of the above code will be:
Are Map1 and Map2 equal? : true Are Map1 and Map3 equal? : false
❮ Java.util - IdentityHashMap
