剑指Offer第2题详解（附Python、Java代码实现）

def replaceSpace(s):
    # return s.replace(" ","%20",s.count(" "))
    return s.replace(' ','%20')

import re
def replaceSpace(self, s):
	return re.sub(r' ', '%20', s)

public class Solution {
    public String replaceSpace(StringBuffer str) {
    	return str.toString().replace(" ","%20");
    }
}

package com.bigdataBC.JzOffer;

public class JzOffer2 {
    public String replaceSpace(StringBuffer str) {
//        return str.toString().replace(" ", "%20");
        StringBuilder newsb=new StringBuilder();
        for (int i=0;i<str.length();i++) {
            char c=str.charAt(i);
            if (c==' ') {
                newsb.append("%20");
            }else{
                newsb.append(c);
            }
        }
        return newsb.toString();
    }
}