Java 用正则表达式 截取字符串中的数字

package com.benywave;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test {
    public static void main(String[] args) {
        String str = "急救电话    112";
        Pattern pattern = Pattern.compile("[0-9]{1,}");
        Matcher matcher = pattern.matcher((CharSequence) str);
        while (matcher.find()) {
            if (!"".equals(matcher.group()))
            System.out.println("截取字符串中的数字为：" + matcher.group());
            }
    }
}