java中的字符串数 [英] number out of string in java

问题描述

我有类似ali123hgj的东西。我想要123整数。我怎样才能在java中创建它？

I have something like "ali123hgj". i want to have 123 in integer. how can i make it in java?

推荐答案

使用以下RegExp（参见 http://java.sun.com/docs/books/tutorial/essential/regex/ ）：

Use the following RegExp (see http://java.sun.com/docs/books/tutorial/essential/regex/):

\d+

By：

final Pattern pattern = Pattern.compile("\\d+"); // the regex
final Matcher matcher = pattern.matcher("ali123hgj"); // your string

final ArrayList<Integer> ints = new ArrayList<Integer>(); // results

while (matcher.find()) { // for each match
    ints.add(Integer.parseInt(matcher.group())); // convert to int
}

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