数字与字母分割

public class Main{
	public static void main(String args[]){
		String s="ahkjdfnajk321anbkjdfbnjakfdkja4213746187";
		s=s+".";
		int n=s.length();
		char a[]=new char[n];
		a=s.toCharArray();
		int start=-1;
		int end=-1;
		for(int i=1;i<n;i++){
			if(a[i]>=48 && a[i]<=57 && (a[i-1] < 48 || a[i-1] > 57)){
				a[i-1]='^';
			}
			if(a[i]>=48 && a[i]<=57 && (a[i+1] < 48 || a[i+1] > 57)){
				a[i+1]='^';
			}
		}
		s=String.valueOf(a);
		String aa[]=s.split("\\^");
		for (int i = 0 ; i <aa.length ; i++ ){
			System.out.println("--"+aa[i]); 
		} 
	}
}