Java - Write code to check if a string is Numeric using for loop backward

Requirements

Write code to check if a string is Numeric

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String str = "book2s.com";
        System.out.println(isNumeric(str));
    }//from   w  w w.j a  v  a2 s. com

    public static boolean isNumeric(String str) {
        for (int i = str.length(); --i >= 0;) {
            if (!Character.isDigit(str.charAt(i))) {
                return false;
            }
        }
        return true;
    }
}

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