Java中的IdentityHashMapkeySet()方法

Identity_Hash_Map.keySet()


// Java code to illustrate the keySet() method
import java.util.*;
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
        // Creating an empty IdentityHashMap
        Map<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 keySet() to get the set view of keys
        System.out.println("The set is: " + Identity_hash.keySet());
    }
}


Initial Mappings are: {30=You, 15=4, 10=Geeks, 25=Welcomes, 20=Geeks}
The set is: [30, 15, 10, 25, 20]


// Java code to illustrate the keySet() method
import java.util.*;
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
        // Creating an empty IdentityHashMap
        Map<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 keySet() to get the set view of keys
        System.out.println("The set is: " + Identity_hash.keySet());
    }
}


Initial Mappings are: {Welcomes=25, 4=15, You=30, Geeks=20}
The set is: [Welcomes, 4, You, Geeks]