• 探秘Java中的String、StringBuilder以及StringBuffer
      1. class Solution {
      2.   public String replaceSpace(String s) {
      3.       StringBuilder tmp = new StringBuilder();
      4.       for (int i = 0; i < s.length(); i++) {
      5.           char c = s.charAt(i);
      6.           if (c == ' ') {
      7.               tmp.append("%20");
      8.           } else {
      9.               tmp.append(c);
      10.           }
      11.       }
      12.       return tmp.toString();
      13.   }
      14. }