LinkedHashMap is child class of HashMap and it is almost same as HashMap except the below differences.
| HashMap | LinkedHashMap |
| Underlying data structure of HashMap is HashTable. | Underlying data structure of LinkedHashMap is HashTable + LinkedList |
| Insertion order is not preserved. | Insertion order is preserved.. |
| Introuduced in Java1.2. | Introuduced in Java1.4. |
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Very good site … the concepts are very clear and understandable…