Question

Create a project with a Program class and write the following two methods (headers provided) as described below:

1. A Method, public static int InputValue(int min, int max), to input an integer number that is between (inclusive) the range of a lower bound and an upper bound. The method should accept the lower bound and the upper bound as two parameters and allow users to re-enter the number if the number is not in the range or a non-numeric value was entered.
2. A Method, public static bool IsValid(string id), to check if an input string satisfies the following conditions: the string’s length is 5, the string starts with 2 uppercase characters and ends with 3 digits. For example, “AS122” is a valid string, “As123” or “AS1234” are not valid strings.

Answer 1

Java code given below :-

import java.util.*;

import java.io.*;

public class HelloWorld{
   
public static int InputValue(int min, int max)
{
    Scanner in = new Scanner(System.in);
     while (true) {
            System.out.println("Enter a number."); // get a number
            String input = in.next();
            int number = 0;
            try {
                number = Integer.parseInt(input); // convert string to integer
                if(number>=min && number<=max)   // if number between lower bound and upper bound(inclusive)
                     {
                            System.out.println("number is valid.");
                     }
                else
                  {
                     while (number< min || number >max) // if number not between lower bound and upper bound(inclusive)
                {
                         System.out.println("re-enter a number :"); // re-enter number
                            number = in.nextInt();
                 }
                    System.out.println("number is valid.");
                }
                  
                 break;
            }
            catch (NumberFormatException ne) {
                System.out.println("Input is not a number, continue"); // if user enter a non-number
            }
     }
     return 0;
}
public static boolean IsValid(String id)
{
   char[] sArr = id.toCharArray(); // convert given string to char array
   boolean x=false;
   if(sArr.length==5) // if length of array is 5 then
   {// check given string is valid or not
       if( ('A'<=sArr[0] && sArr[0]<='Z') && ('A'<=sArr[1] && sArr[1]<='Z') && ('0'<=sArr[2] && sArr[2]<='9') && ('0'<=sArr[3] && sArr[3]<='9') && ('0'<=sArr[4] && sArr[4]<='9'))
       {
           x=true;
       }
       else{
           x=false;
       }
   }
   else{ // if length of array is not 5
       x=false;
   }
   return x; // return boolean value
}
public static void main(String []args){
    Scanner in = new Scanner(System.in);
    Scanner sc = new Scanner(System.in);
        System.out.println("Enter a lower bound :"); // get lower bound
        int lower = in.nextInt();
        System.out.println("Enter a upper bound :"); // get upper bound
        int upper = in.nextInt();
        InputValue(lower,upper); // call InputValue() function
      
       System.out.println("\nEnter a String :"); // get String
        String str = sc.nextLine();
      
       boolean x =IsValid(str); // call IsValid() function
        if(x==true)
       {
               System.out.println("valid String.");   // if string is valid
       }
       else{
           System.out.println("In-valid String.");   // if string is in-valid
       }
     }
}

Screenshot of code and output :-