package String; public class checkFirstCharOfStr { public static void main(String[] args) { String str = "helloo777"; Boolean flag1 = str.substring(0, 1).matches("[0-9]"); //[0-9] Regular expression to match the number between 0-9. //we can also use \\d to to check every digit if(flag1){ System.out.println("First Character is a number..!"); }else{ System.out.println("First character is not a number..!"); } } }