java如何判断输入的字符串是不是数字,java判断输入字符串是否为数字

public class ZhStringUtil {/** * 判断字符串是否为数字 * @param str * @return */public static boolean isNumberic(String str) {Pattern pattern = Pattern.compile("[0-9]*");return pattern.matcher(str).matches();}/** * 判断一个字符串是否为字母 * @param fstrData * @return */public static boolean check(String fstrData) {char c = fstrData.charAt(0);if (((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))) {return true;} else {return false;}}/** * 判断是否为汉字 * @param str * @return */ public static boolean vd(String str) { String regEx = "[u4e00-u9fa5]"; Pattern pat = Pattern.compile(regEx); Matcher matcher = pat.matcher(str); boolean flg = false; if (matcher.find()) flg = true; return flg; }}