![]() ("WeakHashMap size after GC= " + studentMap. ![]() Java, Kotlin WeakReference SoftReference PhantaReference. To create a Weak Reference Object, we must explicitly specify this to the JVM. ("Initial WeakHashMap size = " + studentMap.size()) Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. When we create an object in Java, an object isn’t weak by default. WeakHashMap studentMap = new WeakHashMap() ![]() The behavior of the WeakHashMap class depends in part upon the actions of the garbage collector though. Platform Android Studio Google Play Jetpack Kotlin Docs Games English Bahasa Indonesia Español América Latina Português Brasil. Here is an example that displays the effect of running System.gc() for WeakHashMap. Once an object has no references or has only weak references, it becomes eligible for garbage collection.Ī WeakHashMap uses only weak references to its key values. A synchronized WeakHashMap may be constructed using the Collections.synchronizedMap method.Īn object can have both weak and string (normal) references.Īs long as at least one strong reference exists to the object, the referenced object can never be garbage collected.Ī weak reference by itself doesnot prevent an object from being garbage collected. Rather than creating a new object, it looks up the existing one in the mapping and uses it. A mapping is called canonicalized if it holds only one instance of a particular value. It supports null values and the null key. As stated by Java documentation, weak references are most often used to implement canonicalizing mappings. This allows an element in the map to be garbage-collected when the key is unused. ![]() A WeakHashMap implements a map that uses a weak reference to the keys.
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