Core Java Interview Questions - Differene Questions

1. Difference between Vector and ArrayList
2. Difference between Array and ArrayList




Answers
1. Vector and ArrayList?

• All methods in vector are synchronized while in Arraylist they are not synchronized(not threadsafe)

• When Vector reaches the end of its size, it doubles its size to accomdate new objects. whereas Arraylist grows by 50% of initial size.
  

2. Array and ArrayList?

• Array is can store only a set similar objects and its size is fixed
• ArrayList is internally an error, but can grow dynamically (so size is not fixed), its not synchronized.