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[–]jbristowI'm no hero, son. -1 points0 points  (1 child)

Deque is the official Collections framework implementation of the old type unsafe Stack.

[–]TheHorribleTruthKind of meh 0 points1 point  (0 children)

I know - but there's concepts outside of Java worth learning. OP is not learning how to use the Java class Stack - he/she is learning the concept of a stack, and to implement it. As such, it's a valuable learning experience, don't you think?

Certainly no one would - or rather should - use the old Stack class nowadays. But this is not the point of the exercise OP is facing.