剑指offer第二题（空格替换）

问题描述：

  在字符串中把空格替换成%20。比如字符串“How are you, world!”替换后的字符串是“How%20are%20yout,%20world!”

代码：

package cn.wzq.sword_finger_offer;

public class Sword02 {

    public StringBuffer replaceSpace(String string) {
        StringBuffer stringBuffer = new StringBuffer();
        int length = string.length();
        for (int i = 0; i < length; i++) {
            if (' ' != (string.charAt(i))){
                stringBuffer.append(string.charAt(i));
            }else {
                stringBuffer.append("%20");
            }
        }
        return stringBuffer;
    }

    public static void main(String[] args){
        String word = "How are yout, world!";
        Sword02 sword02 = new Sword02();
        StringBuffer wordBuffer = sword02.replaceSpace(word);
        System.out.println(wordBuffer);
    }
}