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));
}
}