JAVA朴素解法-两种类型

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        String a=in.next();
        System.out.println(getString(a));
    }
    public static  String getString(String a){
        char[] chararr = a.toCharArray();
        for(int i=0;i<chararr.length/2;i++){
            char tmp=chararr[i];
            chararr[i]=chararr[chararr.length-1-i];
            chararr[chararr.length-1-i]=tmp;
        }
        return new String(chararr);
    }
    public static  String getString1(String a){
        return new StringBuilder(a).reverse().toString());
    }

}