题解 | #字符逆序#

我知道StringBuilder有reverse方法但我偏不用

import java.util.Scanner;

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

        char[] charArray = s.toCharArray();
        char[] reverseArray = new char[charArray.length];

        int j = 0;
        for (int i = charArray.length - 1; i >= 0; i--) {
            reverseArray[j++] = charArray[i];
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < reverseArray.length; i++) {
            sb.append(reverseArray[i]);
        }

        System.out.println(sb);
    }
}