Hashtable get() Method in Java
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() methodimport 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() methodimport 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.
