剑指05 替换空格

剑指 Offer 05. 替换空格

class Solution {
    public String replaceSpace(String s) {
        if (s == null)
            return "";
        int newMaxSize = s.length() * 3;
        char[] newString = new char[newMaxSize];
        int newIndex = 0, oldIndex = 0;
        for (oldIndex = 0; oldIndex < s.length(); oldIndex++) {
            char currChar = s.charAt(oldIndex);
            if (currChar == ' ') {
                newString[newIndex++] = '%';
                newString[newIndex++] = '2';
                newString[newIndex++] = '0';
            }
            else {
                newString[newIndex++] = currChar;
            }
        }
        String ans =  new String(newString, 0, newIndex);
        return ans;
    }
}