Question

This is another attempt to ask this question:

I need a Java program that asks the user for a String. the string must be atleast 7 character and only words and/or numbers, the program should read this input and output “Valid”. No special characters or whitespaces are allowed, if so output “Invalid”

*** Please note: The program must be able to know if the string is less than 7 characters and output INVALID. Also the program must be able to detect WHITESPACES and output INVALID. Please test beforehand.

Answer 1

import java.util.Scanner;

public class ValidString {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc = new Scanner(System.in);

String str = sc.nextLine();

boolean invalid = false;

int count = 0;

for(int i=0 ; i<str.length() ; ++i) {

if(!Character.isDigit(str.charAt(i)) && !Character.isLetter(str.charAt(i))) {

invalid = true;

break;

}else {

++count;

}

}

if(!invalid) {

if(count >=7)

System.out.println("VALID");

else

System.out.println("INVALID");

}else {

System.out.println("INVALID");

}

}

}
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See OUTPUT

3 import java.util.Scanner 4 5 public class ValidString f 7 public static void main(String[] args) I //TODO Auto-generated method stub Scanner sc new ScannerCSystem. in); String str = sc.next Line(); boolean invalid false; int count0 for(int i-0; i<str.lengthO ++i) 10 12 13 14 15 16 17 18 19 if(!Character. isDigit(str.charAt(i)) && !Character.isLetter(str.charAt(i))) i invalid true; break else t ++count; Console 3 <terminated> ValidString [Java Application] /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/bin/java (11-May-2019, Hello how ar ypu? INVALID


Thanks, PLEASE COMMENT if there is any concern.