java 判断一个字符串是否是由数据组成网络收藏

// 判断一个字符串是否都为数字
public boolean isDigit(String strNum) {
return strNum.matches("[0-9]{1,}");
}

// 判断一个字符串是否都为数字
public boolean isDigit(String strNum) {
Pattern pattern = Pattern.compile("[0-9]{1,}");
Matcher matcher = pattern.matcher((CharSequence) strNum);
return matcher.matches();
}

    //截取数字
    public String getNumbers(String content) {
        Pattern pattern = Pattern.compile("\\d+");
        Matcher matcher = pattern.matcher(content);
        while (matcher.find()) {
            return matcher.group(0);
        }
        return "";
    }