1 public class T004 {
 2     public static void main(String[] args){
 3         System.out.println(replaceBlank("we are happy"));
 4     }
 5     public static String replaceBlank(String s){
 6         String r = "%20";
 7         String result = "";
 8         for(int i=0;i<s.length();i++){
 9             if(s.charAt(i)==‘ ‘){
10                 result +=r;
11             }else{
12                 result += s.charAt(i);
13             }
14         }
15         return result;
16         
17     }
18 }