剑指offer-替换空格（java语言）

import java.util.Scanner;public class ReplaceBlack {public static String replaceBlack(String[] str){String s="";int i;for( i=0;i<str.length-1;i++){s=s+str[i]+"20%";}s+=str[i];return s;}public static void main(String[] args) {Scanner s=new Scanner(System.in);String str=s.nextLine();String[] newStr=str.split(" ");System.out.println(ReplaceBlack.replaceBlack(newStr));}}