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As a result ArrayList is slower than LinkedList and the latter is preferred in case you need to perform insert and delete operations in the middle of a collection.LinkedList worked 200 times faster than ArrayList when 0.1 million elements were inserted at the start of the collection.
1. Synchronization. ArrayList is non-synchronized which means multiple threads can work on ArrayList at the same time. For example if one thread is performing an add operation on ArrayList, there can be an another thread performing remove operation on ArrayList at the same time in a multithreaded environment. While Vector is synchronized.