Differences between vector and arraylist in Java

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1. vector is thread-synchronous, so it is thread-safe, while arraylist is asynchronous and insecure. If thread security is not taken into account, arraylist is generally used for high efficiency.
2. If the number of elements in the set is greater than the length of the current set array, the growth rate of vector is 100% of the current array length, and that of arraylist is 50% of the current array length. if you use a large amount of data in a collection, using vector has some advantages.
3. If you look for data at a specified position, the time used by the vector and arraylist is the same, both of which are 0 (1). In this case, you can use both vector and arraylist. If it takes 0 (n-I) n to move the data at a specified position as the total length, you should consider using linklist, because it takes 0 (1) to move data at a specified location, and the time spent querying data at a specified location is 0 (I ).