HashSet
|
TreeSet
|
| 1The underlying data structure is Hashtable | 1The underlying data structure is balanced tree |
| 2Heterogeneous objects are allowed | 2 Heterogeneous objects are not allowed by defalut |
| 3Insertion order is not preserved and it is based on hashcode of the objects | 3 Insertion order is not preserved and all the objects are inserted according to some sorting order. |
| 4null insertion is possible | 4 As the first element only null insertion is possible and in all other cases we will get NullPointerException (After null insertion other insertion not possible) |
What is the difference between hashset and treeset ?
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