利用StringBuilder进行字符逆序排列,再利用toString()转化为字符串
import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
while(sc.hasNextInt()){
int n=sc.nextInt();
StringBuilder sb=new StringBuilder();
sb.append(n);
System.out.println(sb.reverse().toString());
}
}
}