JAVA字符串反转

import java.util.Scanner;

public class StrReversal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        System.out.println(new StringBuilder(str).reverse());
    }
}

import java.util.Scanner;

public class StrReversal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        char[] chars = str.toCharArray();
        String reverse = "";
        for (int i = chars.length - 1;i>=0;i--){
            reverse += chars[i];
        }
        System.out.println(reverse);
    }
}

import java.util.Scanner;

public class StrReversal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        char[] chars = str.toCharArray();
        StringBuilder reverse = new StringBuilder();
        for (int i = chars.length - 1;i>=0;i--){
            reverse.append(chars[i]);
        }
        System.out.println(reverse);
    }
}