(1) Difference between ArrayList and Linked List?
(2) Difference between ArrayList and vector?
(3) Difference between String and StringBuffer?
(4) Difference between StringBuilder and StringBuffer?
(5) what is hashmap? is it synchronized or not?

Question

(1) Difference between ArrayList and Linked List?
(2) Difference between ArrayList and vector?
(3) Difference between String and StringBuffer?
(4) Difference between StringBuilder and StringBuffer?
(5) what is hashmap? is it synchronized or not?

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