剑指offer题解【替换空格】-java

public class Solution {    public static void main(String[] args) {        StringBuffer str = new StringBuffer();        str.append("We Are Happy");        String result = replaceSpace(str);        System.out.println(result);    }    public static String replaceSpace(StringBuffer str) {        while (str.indexOf(" ") > -1) {        str.replace(str.indexOf(" "), str.indexOf(" ") + 1, "%20");        }        return str.toString();    }}