java如何实现数位分离

import java.util.Scanner;
public class 数位分离 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		String s=sc.nextLine();
		char[] a=s.toCharArray();
		String b="";
		for(int i=0;i<a.length;i++){
			b =b+a[i]+" ";
		}
		System.out.print(b);
	}
}