i am not able to check the non string value such as a-z and A-Z using public method
Scanner input = new Scanner(System.in);
System.out.print("Enter your First Name: ");
String First_name = input.nextLine();
Scanner last = new Scanner(System.in);
System.out.print("Enter your Last Name: ");
String Last_name = last.nextLine();
here is public method
public static boolean check_non_string_value (String First_name, String Last_name){
// dont know how to check the input here
}
You can use regular expressions but it's also relatively simple to just loop over each string yourself and use Character.isLetter() to check each character:
for (char c : firstName.toCharArray()) {
if (!Character.isLetter(c))
return false;
}
for (char c : lastName.toCharArray()) {
if (!Character.isLetter(c))
return false;
}
return true;
Note that I've used more conventional names: firstName and lastName. You should always try to follow Java's naming conventions (i.e. use camelCase). Your method name should also be checkNonStringValue.
With regular expressions, you could do something like:
private static final Pattern letters = Pattern.compile("\\p{Alpha}+");
...
return letters.matcher(firstName).matches() &&
letters.matcher(lastName).matches();
\p{Alpha} is a pre-defined character class meaning [a-zA-Z]. See Pattern for more details.
This method valid for a-z and A-Z characters
public static boolean check_non_string_value (String First_name, String Last_name){
if(First_name.matches("[a-zA-Z]+")&&Last_name.matches("[a-zA-Z]+")){
system.out.println("Valid input");
return true;
}
return false;
}
This method valid for all word characters
public static boolean check_non_string_value (String First_name, String Last_name){
if(First_name.matches("\\w")&&Last_name.matches("\\w")){
system.out.println("Valid input");
return true;
}
return false;
}
\wis equivalent to [a-zA-Z_0-9] so you will match my_nam3 but not Jérémy.
[\\w]. \\w is enough. Also this will also match digits and _.