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

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import java.util.LinkedList;

public class ThousandSeparator {

public String thousandSeparator(int n) {

final LinkedList<Integer> list = getDigits(n);

final StringBuilder result = new StringBuilder();

for (int i = 3 ; !list.isEmpty() ; i = (i + 1) % 3) {

if (i == 0) result.append('.');

result.append(list.pop());

}

return result.reverse().toString();

}

private LinkedList<Integer> getDigits(int number) {

final LinkedList<Integer> result = new LinkedList<>();

if (number == 0) {

result.add(0);

}

while (number > 0) {

result.add(number % 10);

number /= 10;

}

return result;

}