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("\^");
        int count[]=new int[aa.length];
        for (int i = 0 ; i <aa.length ; i++ ){
            int nn=aa[i].length();
            char aaa[]=new char[nn];
            aaa=aa[i].toCharArray();
            for(int j=0;j<nn;j++){
                if(aaa[j]>=48 && aaa[j]<=57){
                    count[i]++;
                }
            }
        } 
        String ss=null;
        for(int i=0;i<aa.length;i++){
            if(count[i]>6){
                ss=aa[i];
            }
        }
        System.out.println(ss);
    }
}