The AbstractMap.get() method of AbstractMap class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the map contains no such mapping for the key.
Syntax:
AbstractMap.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 AbstractMap.get() method:
Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the get() method  import java.util.*;  public class Abstract_Map_Demo {    public static void main(String[] args)    {          // Creating an empty AbstractMap        AbstractMap<Integer, String>            abs_map = new HashMap<Integer, String>();          // Mapping string values to int keys        abs_map.put(10, "Geeks");        abs_map.put(15, "4");        abs_map.put(20, "Geeks");        abs_map.put(25, "Welcomes");        abs_map.put(30, "You");          // Displaying the AbstractMap        System.out.println("Initial Mappings are: "                           + abs_map);          // Getting the value of 25        System.out.println("The Value is: "                           + abs_map.get(25));          // Getting the value of 10        System.out.println("The Value is: "                           + abs_map.get(10));    }} |
Output:
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
The Value is: Welcomes
The Value is: Geeks
Program 2: Mapping Integer Values to String Keys.
// Java code to illustrate the get() method  import java.util.*;  public class Abstract_Map_Demo {    public static void main(String[] args)    {          // Creating an empty AbstractMap        AbstractMap<String, Integer>            abs_map = new HashMap<String, Integer>();          // Mapping int values to string keys        abs_map.put("Geeks", 10);        abs_map.put("4", 15);        abs_map.put("Geeks", 20);        abs_map.put("Welcomes", 25);        abs_map.put("You", 30);          // Displaying the AbstractMap        System.out.println("Initial Mappings are: "                           + abs_map);          // Getting the value of "Geeks"        System.out.println("The Value is: "                           + abs_map.get("Geeks"));          // Getting the value of "You"        System.out.println("The Value is: "                           + abs_map.get("You"));    }} |
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
The Value is: 20
The Value is: 30
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
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