在文本中查找数字并将其求和

只需按组提取数字，而不必担心空格。

public static void main(String[] args) throws Exception {    String source = " abc 2 de fdfg 3 4 fdfdfv juk  @  dfdfgd 45";    // "\d+" will get all of the digits in the String    Pattern pattern = Pattern.compile("\d+");    Matcher matcher = pattern.matcher(source);    int sum = 0;    // Convert each find to an Integer and accumulate the total    while (matcher.find()) {        sum += Integer.parseInt(matcher.group());    }    System.out.println("Sum: " + sum);}

结果：

总计：54