Write code to check if a string is Numeric via for loop and Character.isDigit() method
import java.util.HashMap; public class Main{ public static void main(String[] argv){ String string = "book2s.com"; System.out.println(isNumeric(string)); }//from ww w. j ava2 s . c o m public static boolean isNumeric(String string) { if (OddStringUtil.isEmpty(string)) { return false; } string = string.trim(); char[] chars = string.toCharArray(); for (char C : chars) { if (!Character.isDigit(C)) { return false; } } return true; } /** * Simply checks if the String is null or has * no non-whitespace characters. * @param e * @return */ public static boolean isEmpty(String e) { return e == null || e.trim().length() == 0; } }