AbstractMap get() Method in Java with Examples
Last Updated :
26 Oct, 2018
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
// 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
// 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.