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- Synchronization : 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.
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Data growth: 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.
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