WeakHashMap get() Method in Java
The java.util.WeakHashMap.get() method of WeakHashMap 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:
WeakHashMap.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.WeakHashMap.get() method:
Program 1:
// Java code to illustrate the get() method import java.util.*; public class Weak_Hash_Map_Demo { public static void main(String[] args) { // Creating an empty WeakHashMap Map<Integer, String> weak_hash = new WeakHashMap<Integer, String>(); // Mapping string values to int keys weak_hash.put( 10 , "Geeks" ); weak_hash.put( 15 , "4" ); weak_hash.put( 20 , "Geeks" ); weak_hash.put( 25 , "Welcomes" ); weak_hash.put( 30 , "You" ); // Displaying the WeakHashMap System.out.println( "Initial Mappings are: " + weak_hash); // Getting the value of 25 System.out.println( "The Value is: " + weak_hash.get( 25 )); // Getting the value of 10 System.out.println( "The Value is: " + weak_hash.get( 10 )); } } |
Initial Mappings are: {30=You, 15=4, 10=Geeks, 25=Welcomes, 20=Geeks} The Value is: Welcomes The Value is: Geeks
Program 2:
// Java code to illustrate the get() method import java.util.*; public class Weak_Hash_Map_Demo { public static void main(String[] args) { // Creating an empty WeakHashMap Map<String, Integer> weak_hash = new WeakHashMap<String, Integer>(); // Mapping int values to string keys weak_hash.put( "Geeks" , 10 ); weak_hash.put( "4" , 15 ); weak_hash.put( "Geeks" , 20 ); weak_hash.put( "Welcomes" , 25 ); weak_hash.put( "You" , 30 ); // Displaying the WeakHashMap System.out.println( "Initial Mappings are: " + weak_hash); // Getting the value of "Geeks" System.out.println( "The Value is: " + weak_hash.get( "Geeks" )); // Getting the value of "You" System.out.println( "The Value is: " + weak_hash.get( "You" )); } } |
Initial Mappings are: {Welcomes=25, 4=15, You=30, Geeks=20} 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.
Recommended Posts:
- WeakHashMap put() Method in Java
- WeakHashMap size() method in Java
- WeakHashMap values() Method in Java
- WeakHashMap putall() Method in Java
- WeakHashMap remove() method in Java
- WeakHashMap keySet() method in Java
- WeakHashMap clear() Method in Java
- WeakHashMap containsKey() Method in Java
- WeakHashMap entrySet() Method in Java
- WeakHashMap containsValue() Method in Java
- WeakHashMap isEmpty() Method in Java with Examples
- Hashmap vs WeakHashMap in Java
- WeakHashMap class in Java
- Java lang.Long.builtcount() method in Java with Examples
- Java lang.Long.reverse() method in Java with Examples
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.