第一个比较傻的做法

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc = new Scanner(System.in);

// String string = sc.next();

String string = "abcd12345ed125ss123058789";

int start = 0;

int end = 0;

int length = 0;

int maxLegth = 0;

int maxStart = 0;

int maxEnd = 0;

boolean last = false;

for (int i = 0; i < string.length(); i++) {

char c = string.charAt(i);

if ((c >= '0' && c <= '9')) {// 当前是数字

length++;

if (last) {// 如果上一个也是数字 长度+1

if (i == string.length() - 1) {

if (length >= maxLegth) {

maxStart = start;

maxEnd = string.length();

maxLegth = length;

}

}

} else {// 如果不是

last = true;

start = i;

}

} else {

if (last) {

if (length >= maxLegth) {

maxStart = start;

maxEnd = i;

maxLegth = length;

}

}

last = false;

start = 0;

end = 0;

length = 0;

}

}

if (maxLegth == 0) {

System.out.println(0);

} else {

System.out.println(string.substring(maxStart, maxEnd));

System.out.println(maxLegth);

}

	}