Java - Write code to check if a string is Numeric using BigDecimal

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Requirements

Write code to check if a string is Numeric using BigDecimal

Demo

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

public class Main{
    public static void main(String[] argv){
        String str = "book2s.com";
        System.out.println(isNumeric(str));
    }/*from  ww  w .  j ava  2  s  .com*/
    private static boolean isNumeric(String str) {
        if (StringHelper.isBlank(str)) {
            return false;
        }

        boolean flag = false;
        try {
            new BigDecimal(str);
            flag = true;
        } catch (NumberFormatException ex) {
            flag = false;
        }

        return flag;
    }
    public static boolean isBlank(String str) {
        int strLen;
        if (str == null || (strLen = str.length()) == 0)
            return true;
        for (int i = 0; i < strLen; i++)
            if (!Character.isWhitespace(str.charAt(i)))
                return false;

        return true;
    }
}