1 public void test() {
2 2 String a = "hada16@54$1wd!6a41$da1dw5d6&a1d&a41d*w6d14a#d61d";
3 3 /*
4 4 * 正则表达式(一般用这个)
5 5 *
6 6 * */
7 7 String regEx = "[^0-9]";
8 8 Pattern p = Pattern.compile(regEx);
9 9 Matcher m = p.matcher(a);
10 10 String str = m.replaceAll("").trim();
11 11 System.out.println(str);//1654164115614161461
12 12 /*
13 13 *
14 14 * 用字符串处理
15 15 * */
16 16 a = a.trim();
17 17 String b = "";
18 18 if(a != null && !"".equals(a)) {
19 19 for (int i = 0; i < a.length(); i++) {
20 20 if (a.charAt(i)>=48 && a.charAt(i)<=57) {
21 21 b+= a.charAt(i);
22 22 }
23 23 }
24 24 }
25 25 System.out.println(b);//1654164115614161461
26 26 }
