IdentityHashMap clone() Method in Java
Last Updated :
23 Jul, 2018
The java.util.IdentityHashMap.clone() method is used to return a shallow copy of the mentioned hash map. It just creates a copy of the map.
Syntax:
Identity_HashMap.clone()
Parameters: The method does not take any parameters.
Return Value: The method just returns a copy of the hash map.
Below programs are used to illustrate the working of java.util.IdentityHashMap.clone() Method:
Program 1:
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
IdentityHashMap<Integer, String> identity_hash =
new IdentityHashMap<Integer, String>();
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" );
System.out.println( "Initial Mappings are: " +
identity_hash);
System.out.println( "The cloned map: " +
identity_hash.clone());
}
}
|
Output:
Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The cloned map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Program 2:
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
IdentityHashMap<String, Integer> identity_hash =
new IdentityHashMap<String, Integer>();
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 );
System.out.println( "Initial Mappings are: " +
identity_hash);
System.out.println( "The cloned map: " +
identity_hash.clone());
}
}
|
Output:
Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The cloned map: {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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