프로그래머스 C# 인덱스 바꾸기(Concat-문자열 연결, ToCharArray(), P, J)

using System;

public class Solution {
    public string solution(string my_string, int num1, int num2) {
        string answer = "";
        char[] arr = my_string.ToCharArray();
        char temp;
        
        temp = arr[num2];
        arr[num2] = arr[num1];
        arr[num1] = temp;
        
        answer = string.Concat(arr);
        return answer;
    }
}

 

파이썬

////

 

def solution(my_string, num1, num2):
    s = list(my_string)
    s[num1],s[num2] = s[num2],s[num1]
    return ''.join(s)

 

자바

 

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

class Solution {
    public String solution(String myString, int num1, int num2) {
        List<String> list = Arrays.stream(myString.split("")).collect(Collectors.toList());

        Collections.swap(list, num1, num2);
        return String.join("", list);
    }
}

 

 

자바

 

 

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

class Solution {
    public String solution(String myString, int num1, int num2) {
        List<String> list = Arrays.stream(myString.split("")).collect(Collectors.toList());

        Collections.swap(list, num1, num2);
        return String.join("", list);
    }
}

 

 

class Solution {
    public String solution(String my_string, int num1, int num2) {
        String answer = "";

        char[] ch = my_string.toCharArray();

        ch[num1] = my_string.charAt(num2);
        ch[num2] = my_string.charAt(num1);

        answer = String.valueOf(ch);
        return answer;
    }
}