题解 | #替换空格#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param s string字符串 
     * @return string字符串
     */
    public String replaceSpace (String s) {
        // write code here
         StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < s.length(); i++) {
        if (s.charAt(i) == ' ')
            stringBuilder.append("%20");
        else
            stringBuilder.append(s.charAt(i));
    }
    return stringBuilder.toString();
    }
}