updating DIRECTORY.md

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2020-10-27 03:24:22 +00:00
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* Stacks
* [BalancedBrackets](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/BalancedBrackets.java)
* [DecimalToAnyUsingStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/DecimalToAnyUsingStack.java)
* [InfixToPostfix](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/InfixToPostfix.java)
* [NodeStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/NodeStack.java)
* [StackArray](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArray.java)
* [StackArrayList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArrayList.java)