I am working on an assignment right now where I have to enter an input in "ABC123456" format entry and see if it is valid or not. I don't understand how to check each character if it is a number or letter. Here is what I have so far:
import java.util.Scanner;
public class NetID {
public static void main(String[] args) {
Scanner input = new Scanner (System.in);
String userInput, char0thru2, char3thru8, uppercase, netID;
System.out.println("Please enter the NetID to verify:");
userInput = input.nextLine();
if (userInput.length() != 9) {
System.out.println("Your NetID needs to be 9 characters long, it needs to be in this format: ABC123456");
}
if (userInput.length() == 9){
char0thru2 = userInput.substring(0, 3);
char3thru8 = userInput.substring(3, 9);
uppercase = char0thru2.toUpperCase();
}
}
}
Just use a pattern:
String userInput = "ABC133456";
if(!Pattern.matches("[A-Z]{3}[0-9]{6}", userInput))
System.out.println("Your NetID needs to be 9 characters long, it needs to be in this format: ABC123456");
else
System.out.println("Ok!");