替换空格

package leetcode.剑指Offer.替换空格;

public class LeetCode {
    public static void main(String[] args) {
        System.out.println(new Solution().replaceSpace("i s, 20"));
    }
}

class Solution {
    public String replaceSpace(String s) {
        StringBuilder stringBuilder = new StringBuilder();

        for (char c : s.toCharArray()) {
            if (c == ' ') {
                stringBuilder.append("%20");
            } else {
                stringBuilder.append(c);
            }
        }

        return stringBuilder.toString();
    }
}