Write a java program that prompts the user to input a word from the keyboard representing a user id. If the length of the word is between six and ten characters, the program prints the user id. Otherwise, the program print the message “Invalid user id.”

Check output here

import java.util.*;  
class UserInputDemo1  
{  
public static void main(String[] args)  
{  
  Scanner sc= new Scanner(System.in); 
  System.out.print("Enter a string: ");  
  String str= sc.nextLine();                 
  if (str.length() > 6 && str.length() < 10) System.out.println(str);
  else System.out.println("Invalid username");
}  
}