Stack to Deque and ArrayDeque
Use the Deque interface with ArrayDeque instead of the legacy Stack class.
Code Comparison
✕ Legacy Stack
Stack<String> stack = new Stack<>();
stack.push("task");
String next = stack.pop();
✓ Deque API
Deque<String> stack = new ArrayDeque<>();
stack.push("task");
String next = stack.pop();
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Why the modern way wins
Better abstraction
Deque explicitly models both stack and queue operations.
Lower overhead
ArrayDeque avoids Vector's legacy synchronization.
More flexible
The same interface supports LIFO and FIFO algorithms.
Old Approach
Stack
Modern Approach
Deque with ArrayDeque
Since JDK
6
Difficulty
Beginner
JDK Support
Stack to Deque and ArrayDeque
Available
Available since JDK 6 (December 2006)
How it works
Stack extends the legacy synchronized Vector class. Deque models stack operations directly, and ArrayDeque is the preferred general-purpose implementation for in-memory LIFO work.
Related Documentation
Proof