Hashtable toString() Method in Java
The toString() method in the Hashtable class in Java returns a string representation of the key-value mappings contained in the hashtable. The string is in the form of a comma-separated list of key-value pairs enclosed in curly braces.
The toString() method is inherited from the java.util.Hashtable class’s parent class, java.util.Dictionary.
Here’s an example of using the toString() method:
Java
import java.util.Hashtable;Â
public class HashtableExample {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â Â Â Â Â Â Â Â Hashtable<String, Integer> ht = new Hashtable<>();Â Â Â Â Â Â Â Â ht.put("Alice", 25);Â Â Â Â Â Â Â Â ht.put("Bob", 30);Â Â Â Â Â Â Â Â ht.put("Charlie", 35);Â
        System.out.println(ht.toString());    }} |
{Bob=30, Charlie=35, Alice=25}
The java.util.Hashtable.toString() is an inbuilt method of Hashtable that is used to get a string representation of the objects of Hashtable in the form of a set of entries separated by “, “. So basically the toString() method is used to convert all the elements of Hashtable into String.
Syntax:Â
Hash_Table.toString()
Parameter: The method does not take any parameters.
Return value: The method returns the set consisting of the string representation of the elements of the hash table.
Below programs illustrate the working of java.util.Hashtable.toString() method:Â
Program 1:Â
Java
// Java code to illustrate the toString() methodÂ
import java.util.*;Â
public class Hash_Table_Demo {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        // Creating an empty Hashtable        Hashtable<Integer, String> hash_table            = new Hashtable<Integer, String>();Â
        // Inserting elements into the table        hash_table.put(10, "Geeks");        hash_table.put(15, "4");        hash_table.put(20, "Geeks");        hash_table.put(25, "Welcomes");        hash_table.put(30, "You");Â
        // Displaying the Hashtable        System.out.println("Initial table is: "                           + hash_table);Â
        // Displaying the string representation        System.out.println("The set is: "                           + hash_table.toString());    }} |
Initial table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The set is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
Program 2:Â
Java
// Java code to illustrate the toString() methodÂ
import java.util.*;Â
public class Hash_Table_Demo {Â Â Â Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        // Creating an empty Hashtable        Hashtable<String, Integer> hash_table            = new Hashtable<String, Integer>();Â
        // Inserting elements into the table        hash_table.put("Geeks", 10);        hash_table.put("4", 15);        hash_table.put("Geeks", 20);        hash_table.put("Welcomes", 25);        hash_table.put("You", 30);Â
        // Displaying the Hashtable        System.out.println("Initial Table is: "                           + hash_table);Â
        // Displaying the string representation        System.out.println("The set is: "                           + hash_table.toString());    }} |
Initial Table is: {You=30, Welcomes=25, 4=15, Geeks=20}
The set is: {You=30, Welcomes=25, 4=15, Geeks=20}
