Estruturas

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Exemplo de pilha:
Stack<Character> pilha = new Stack<>(); (deprecated)
Usar:
Deque<Character> pilha = new ArrayDeque<>();
http://docs.oracle.com/javase/7/docs/api/java/util/Stack.html

Usar um Stack é mais eficiente do que utilizar um ArrayList como se fosse uma pilha.

Exemplo de lista:
ArrayList<Integer> lista = new ArrayList<>();
http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html

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