We then invoke the garbage collector using System.gc() and wait for a moment to allow the garbage collector to remove the weakly referenced keys. After putting the key-value pairs, we set key1 and key2 references to null. The Key class is a custom class that overrides the toString() method to provide a meaningful string representation. In this example, we create a WeakHashMap and put two Key objects ( key1 and key2) as keys. ("Size of WeakHashMap after garbage collection: " + weakHashMap.size()) Size of the WeakHashMap will be 0 as the weakly referenced keys have been removed Wait for a moment to allow the garbage collector to remove the weakly referenced keys ("Size of WeakHashMap: " + weakHashMap.size()) Put key-value pairs into the WeakHashMap Here’s a code example that demonstrates the usage of WeakHashMap: import This means that if a key is no longer strongly referenced elsewhere in the program, it becomes eligible for garbage collection, allowing the corresponding entry in the WeakHashMap to be automatically removed. The purpose of the WeakHashMap in Java is to provide a map implementation that uses weak references for its keys. What is the purpose of the WeakHashMap in Java? The size of the IdentityHashMap becomes 1 after the removal. We retrieve the values associated with key1 and key2, and then remove key1 from the IdentityHashMap. The size of the IdentityHashMap will be 2 because it considers them as distinct keys due to their different object references. In this example, we create an IdentityHashMap and put two different String objects ( key1 and key2) as keys, even though they have the same content. ("Size of IdentityHashMap after removal: " + identityMap.size()) Size of the IdentityHashMap will be 1 after removal ("Size of IdentityHashMap: " + identityMap.size()) Size of the IdentityHashMap will be 2 because key1 and key2 are different objects Put key-value pairs into the IdentityHashMap Create two different String objects with the same content IdentityHashMap identityMap = new IdentityHashMap() Here’s a code example that demonstrates the usage of IdentityHashMap: import It is useful in scenarios where object identity is more important than the equality defined by the equals() method. This means that two keys are considered equal only if they refer to the same object in memory. The purpose of the IdentityHashMap in Java is to compare keys based on their reference equality rather than using the equals() method. Please read PriorityQueue Explain the purpose of the IdentityHashMap in Java. Concurrent Collections What is a PriorityQueue ? In this section, we will cover various advanced level Java Collections Interview Questions. Please read Generics: Type Erasure Advanced Level Java Collections Interview Questions Please read Why Generics was Introduced in Java 5? What is Type Erasure? Please read fail-fast iterator Vs fail-safe iterator Why Generics was Introduced in Java 5? Please read CopyOnWriteArrayList vs SynchronizedList fail-fast iterator Vs fail-safe iterator Please read Comparable vs Comparator CopyOnWriteArrayList vs SynchronizedList Please read TreeMap Comparable vs Comparator Please read LinkedHashMap What is TreeMap ? Please read HashMap vs Hashtable vs SynchronizedHashMap vs ConcurrentHashMap What is LinkedHashMap ? HashMap vs Hashtable vs SynchronizedHashMap vs ConcurrentHashMap Please read HashMap for in-depth understanding of the HashMap. This is most popular Java Collections Interview Questions. Please read ArrayList vs LinkedList Working of HashMap? Explain Internal Working of HashMap Please read ArrayList vs Vector ArrayList vs LinkedList Please read Array vs ArrayList for in-depth understanding of the differences. This is one of the most frequently asked Java Collections Interview Questions. Please read All About ArrayList Array vs ArrayList Please read Collections Framework – High Level View Working of ArrayList? How does an ArrayList Grow? What is Collections Framework Hierarchy ? In this section, we will cover various basic Java Collections Interview Questions. What is the purpose of the NavigableMap interface in Java?īasic Java Collections Interview Questions.What is the purpose of the Deque interface in Java?.What is the purpose of the WeakHashMap in Java?.Explain the purpose of the IdentityHashMap in Java.Advanced Level Java Collections Interview Questions.fail-fast iterator Vs fail-safe iterator.CopyOnWriteArrayList vs SynchronizedList.HashMap vs Hashtable vs SynchronizedHashMap vs ConcurrentHashMap.Working of HashMap? Explain Internal Working of HashMap.Working of ArrayList? How does an ArrayList Grow?.What is Collections Framework Hierarchy ?.Basic Java Collections Interview Questions.
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