Question

java从键盘输入一个字符串对该字符串逆转，先后输出逆转前后的字符串

从键盘输入一个字符串对该字符串逆转先后输出逆转前后的字符串

Answer 1

import java.util.*;
public class Egg{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();
        scan.close();
        System.out.println("逆转前：" + line);
        String tmp = "";
        for(int i = line.length() - 1; i >= 0; i--){
            tmp += line.charAt(i);
        }
        System.out.println("逆转后：" + tmp);
    }
}

Answer 2

String s;
System.out.println("字符串:"+s);
char[] array = s.toCharArray();
String reverse = "";
for (int i = array.length - 1; i >= 0; i--)
reverse += array[i];
System.out.println("逆转:"+reverse);