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samar
arraylist and vector
1 Answer(s)      4 years and a month ago
Posted in : Java Interview Questions


what is the diff b/w arraylist and vector?

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October 30, 2010 at 11:04 AM


Hi,

Here is the answer.

ArrayList is not thread-safe whereas Vector is thread-safe. In Vector class each method like add(), get(int i) is surrounded with a synchronized block and thus making Vector class thread-safe.

Internally, both the ArrayList and Vector hold onto their contents using an Array. When an element is inserted into an ArrayList or a Vector, the object will need to expand its internal array if it runs out of room. A Vector defaults to doubling the size of its array, while the ArrayList increases its array size by 50 percent.

Thanks.



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