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Java Solution for LeetCode algorithm problems, continually updating
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package g1501_1600.s1556_thousand_separator;
// #Easy #String #2022_04_11_Time_1_ms_(57.92%)_Space_41.7_MB_(31.67%)
public class Solution {
public String thousandSeparator(int n) {
String str = Integer.toString(n);
StringBuilder sb = new StringBuilder();
int i = str.length() - 1;
int j = 1;
while (i >= 0) {
sb.append(str.charAt(i));
j++;
if (j % 3 == 0) {
sb.append(".");
}
i--;
j++;
}
String result = sb.reverse().toString();
if (result.charAt(0) == '.') {
result = result.substring(1);
}
return result;
}
}