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If stacks extends vector does that mean that stacks are syncronized?
Note from Vector Java docs
Unlike the new collection implementations, Vector is synchronized.
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The Stack class represents a last-in-first-out (LIFO) stack of objects. It extends class Vector with five operations that allow a vector to be treated as a stack.
Stack is a subclass of Vector that implements a standard last-in, first-out stack. Stack only defines the default constructor, which creates an empty stack. Stack includes all the methods defined by Vector, and adds several of its own.
Stack is basically a special case of vector. Theoretically speaking vector can grow as you wish. You can remove elements at any index in a vector. However, in case of a stack you can remove elements and insert them only at its top (hence a special case of vector).
They are obsolete, but they are not deprecated.
Yes, it is synchronized, but according to the Javadocs you should prefer a Deque instead of a Stack.
From the Stack Javadocs:
A more complete and consistent set of LIFO stack operations is provided by the Deque interface and its implementations, which should be used in preference to this class. For example:
Deque<Integer> stack = new ArrayDeque<Integer>();
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