在字符串中找出连续最长的数字串

package com.oj5;

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String str = in.nextLine();
int[] length = new int[str.length()];
int[] begin = new int[str.length()];
int pos = 0;

int count = 0;
boolean beginflag = false;
for(int i = 0;i < str.length(); i++)
if(str.charAt(i)<='9'&&str.charAt(i)>='0'&&beginflag==false){
beginflag = true;
count++;
begin[pos] = i;
}else if(str.charAt(i)<='9'&&str.charAt(i)>='0'){
count++;
}else if(beginflag==true&&(str.charAt(i)<'0'||str.charAt(i)>'9')){
length[pos++] = count;
count = 0;
beginflag = false;
}
if(beginflag==true)
length[pos++] = count;

int max = 0;
for(int i = 0;i < pos; i++)
if(length[i]>max)
max = length[i];
if(max==0){
System.out.println(0);
return ;
}

for(int i = 0;i < pos; i++)
if(length[i]==max){
for(int j = begin[i];j < begin[i]+length[i]; j++)
System.out.print(str.charAt(j));
System.out.print(",");
}
System.out.print(max+"\n");

}
}