Sandbox::https://github.com/prashanthigupta/leetcode-algorithms/blob/master/src/BaseballGame.java

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import java.util.LinkedList;

import java.util.List;

public class BaseballGame {

public int calPoints(String[] ops) {

List<Integer> queue = new LinkedList<>();

for (String operation : ops) {

if (operation.equals("+")) {

queue.add(queue.get(queue.size() - 1) + queue.get(queue.size() - 2));

} else if (operation.equals("D")) {

queue.add(queue.get(queue.size() - 1) * 2);

} else if (operation.equals("C")) {

queue.remove(queue.size() - 1);

} else {

queue.add(Integer.valueOf(operation));

}

return sum(queue);

}

private int sum(List<Integer> list) {

int sum = 0;

for (int element : list) {

sum += element;

}

return sum;

}