Java Tutorial #58 - Java Weak HashMap Class with Examples (Map Data Structure)

Java Tutorial #58 - Java Weak HashMap Class with Examples (Map Data Structure)
In this video by Programming for Beginners we will learn Java WeakHashMap Class with Examples (Map Data Structure), using Java Tutorial videos.

The WeakHashMap class of the Java collections framework provides the feature of the hash table data structure..
It implements the Map interface.

Difference Between HashMap and WeakHashMap
All functionalities of hashmaps and weak hashmaps are similar except keys of a weak hashmap are of weak reference, whereas keys of a hashmap are of strong reference.

Example:
// Creating WeakHashMap of numbers
WeakHashMap String, Integer numbers = new WeakHashMap ();

String two = new String("Two");
Integer twoValue = 2;
String four = new String("Four");
Integer fourValue = 4;

// Inserting elements
numbers.put(two, twoValue);
numbers.put(four, fourValue);
System.out.println("WeakHashMap: " + numbers);

// Make the reference null
two = null;

// Perform garbage collection
System.gc();

System.out.println("WeakHashMap after garbage collection: " + numbers);

Methods:
- Create a WeakHashMap
- Add elements in WeakHashMap
- Access elements of WeakHashMap
- Remove elements from WeakHashMap

Map Methods:
put(K, V) method
putAll() method
putIfAbsent(K, V) method
get(K) method
keySet() method
values() method
entrySet() method

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