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Hashtable get() Method in Java
  • Last Updated : 28 Jun, 2018

The java.util.Hashtable.get() method of Hashtable class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the table contains no such mapping for the key.

Syntax:

Hash_Table.get(Object key_element)

Parameter: The method takes one parameter key_element of object type and refers to the key whose associated value is supposed to be fetched.

Return Value: The method returns the value associated with the key_element in the parameter.

Below programs illustrates the working of java.util.Hashtable.get() method:
Program 1:






// Java code to illustrate the get() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Hashtable
        Hashtable<Integer, String> hash_table = 
                           new Hashtable<Integer, String>();
  
        // Inserting the values into 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");
  
        // Displaying the Hashtable
        System.out.println("Initial Table is: " + hash_table);
  
        // Getting the value of 25
        System.out.println("The Value is: " + hash_table.get(25));
  
        // Getting the value of 10
        System.out.println("The Value is: " + hash_table.get(10));
    }
}
Output:
Initial Table is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The Value is: Welcomes
The Value is: Geeks

Program 2:




// Java code to illustrate the get() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Hashtable
        Hashtable<String, Integer> hash_table = 
                            new Hashtable<String, Integer>();
  
        // Inserting the values into 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);
  
        // Displaying the Hashtable
        System.out.println("Initial table is: " + hash_table);
  
        // Getting the value of "Geeks"
        System.out.println("The Value is: " + hash_table.get("Geeks"));
  
        // Getting the value of "You"
        System.out.println("The Value is: " + hash_table.get("You"));
    }
}
Output:
Initial table is: {You=30, Welcomes=25, 4=15, Geeks=20}
The Value is: 20
The Value is: 30

Note: The same operation can be performed with any type of variation and combination of different data types.

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