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LinkedHashMap Map is one of the most important data structures in Java. Sonic hacking contest 2016 entries breeders cup. In this post, I will illustrate how to use different types of maps, such as HashMap, TreeMap, HashTable and LinkedHashMap.
LinkedHashMap Vs. Both the LinkedHashMap and the HashMap implements the Map interface. However, there exist some differences between them. Script facebook phishing. LinkedHashMap maintains a doubly-linked list internally. Due to this, it maintains the insertion order of its elements. The LinkedHashMap class requires more storage than HashMap. Yours forever mp3. HashMap vs ConcurrentHashMap in Java Difference between HashMap and ConcurrentHashMap as well which is the most popular use case of a Map in Java application. You can store any object under specific key using Java HashMap. In our example we are going to store String values. We have already discussed how hashmap works in java.
Following are the notable differences between HashMap and ConcurrentHashMap classes in Java.
| HashMap | ConcurrentHashMap | |
|---|---|---|
| Synchronized | HashMap is not synchronized. | ConcurrentHashMap is synchronized. |
| Thread Safe | HashMap is not thread safe. | ConcurrentHashMap is thread safe. |
| Iterator type | HashMap iterator is fail-fast and ArrayList throws ConcurrentModificationException if concurrent modification happens during iteration. | ConcurrentHashMap is fail-safe and it will never throw ConcurrentModificationException during iteration. |
| Null values | HashMap allows key and value to be null. | ConcurrentHashMap does not allow null key/value. It will throw NullPointerException. |
| Performance | HashMap is faster. | ConcurrentHashMap is slower than HashMap. |
| Since Java Version | 1.2 | 1.5 |