java一串数字如何颠倒过来?

一串数字,如何颠倒过来,如:32456变成65423，求指点

Java code
import java.util.Scanner;
public class Reverse
{ 
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("pLease in put a number:");
        int number=sc.nextInt();
        StringBuffer sb=new StringBuffer(""+number);
        sb.reverse();
        System.out.println(sb.toString());
    }
}

int a[] = {3,2,4,5,6};
int b[] 元旦祝福语= new b[5];
for(int i=0;i<a.length;i++){

b[i] = a[a.length-1]; 
}

这样应该就可以了
 
        StringBuffer sb=new StringBuffer("123456789");
        sb.reverse();
        System.out.println(sb.toString());

public static void main(String[] args) {
  Scanner scan = new Scanner(System.in); //从控制台读取
  String scanReverse = new StringBuilder(scan.next()).reverse().toString();//scan.next（）获取输入字符串,StringBuilder自带有reverse方法
  System.out.println(scanReverse);
  }