Write code to check if a string is Numeric using for loop
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; System.out.println(isNumeric(str)); }/* w ww . j av a 2 s .c o m*/ public static boolean isNumeric(String str) { if (str == null) return false; int sz = str.length(); for (int i = 0; i < sz; i++) if (!Character.isDigit(str.charAt(i))) return false; return true; } }