【劍指Offer】替換空格

題目描述

請實現一個函數，將一個字符串中的空格替換成“%20”。例如，當字符串爲We Are Happy.則經過替換之後的字符串爲We%20Are%20Happy。

---

算法實現：

法一：

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        while(scan.hasNext()){
            String str = scan.nextLine();           
            String[] sc = str.split(" ");
            String result = "";

            for(int i = 0; i < sc.length - 1;i++){              
                result += sc[i] + "%20";
            }

            result = result + sc[sc.length - 1];
            System.out.println(result);
        }
    }
}

法二：

import java.util.Scanner;

public class Main {
    public String replaceSpace(String str) {
        return str.toString().replaceAll("\\s", "%20");
    }

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);      
        while(scan.hasNext()){
            String str = scan.nextLine();
            Main ti = new Main ();
            System.out.println(ti.replaceSpace(str));           
        }
    }
}