Write both sections in the same package. Part A. Write a program PartA and imple

Question

Write both sections in the same package. Part A. Write a program PartA and implement the following in the main method 1. Declare an array arr1 and initialize it to 1, 2, 3, 4, 5, 6, 7, 8, and 9 (From this point on, use the variable length instead of a number to define the capacity of the array.) 2. Declare another array arr2, same length of arr1, without entering any integers. 3. Using a for loop print arri displaying all elements on one line, separated by a comma (commas must be placed only between numbers). 4. Using a while loop, print arr2 displaying all elements on one line, separated by a dash (dashes must be placed only between numbers). 5. Using a for loop, copy all the values of arr1 into arr2 in reverse order, 6. Using a while loop copy all elements of arr1 into arr2 in reverse order. 7. Using a do/while loop print arr1 displaying all elements on one line, separated by a Comma 8. Using a for loop, print arr2 displaying all element on one line, separate by a dash. Expected output Array 1: 1,2,3,4,5,6,7,8,9 Array 2: 0-0-0-0-0-0-0-0-0 Array 1: 1,2,3,4,5,6,7,8,9 Array 2: 9-8-7-6-5-4-3-2-1 Part B Write a program PartB, that contains an array of five names and another array of five passwords (your choice). Use the following Names/Passwords in your string arrays (case sensitive) Bob jelly Jane clock Jill tree Sean computer Mel chip Your program should ask the user to enter a name and a password. If the user enters the correct name with its related password, grant access. If the user enters the wrong name/password (can be either or both), allow the user to re-try only once. If the user still cannot enter the correct name/password, display the following: "Sorry, your name/password does not match our database. Contact the administrator."

Explanation / Answer

PART A:

ArrayDemo.java

public class ArrayDemo {

   public static void main(String[] args) {
      
       //Declaring and initializing array
       int[] arr1={1,2,3,4,5,6,7,8,9};
         
       //Calculating the size of the array
       int length=arr1.length;
         
       //Creating an array2 based on size of the array1
       int[] arr2=new int[length];
         
       //Displaying the elements in Array1
       System.out.print("Array 1: ");
       for(int i=0;i<length;i++)
       {
           System.out.print(arr1[i]);
           if(i<length-1)
           {
               System.out.print(",");
           }
       }

       //Displaying the elements in Array2
       System.out.print(" Array 2: ");
       int i=0;
       while(i<length)
       {
           System.out.print(arr2[i]);
           if(i<length-1)
           {
               System.out.print("-");
           }
           i++;
       }

       //populating the elements of array1 into array2 in reverse order
       int k=0;
       for(i=length-1;i>=0;i--)
       {     
       arr2[k]=arr1[i];
       k++;
       }

         
       //populating the elements of array1 into array2 in reverse order
       i=0;
       int m=length-1;
       while(i<length)
       {
           arr2[i]=arr1[(m)--];
           i++;
       }
         
         
       //Displaying the elements in Array1
       System.out.print(" Array 1: ");
       i=0;
       do
       {
           System.out.print(arr1[i]);
           if(i<length-1)
           {
               System.out.print(",");
           }
           i++;
       }while(i<length);
         
         
       //Displaying the elements in Array2
       System.out.print(" Array 2: ");
       for(i=0;i<length;i++)
       {
           System.out.print(arr2[i]);
           if(i<length-1)
           {
               System.out.print("-");
           }
       }
         
   }

}

______________________

Output:

Array 1: 1,2,3,4,5,6,7,8,9
Array 2: 0-0-0-0-0-0-0-0-0
Array 1: 1,2,3,4,5,6,7,8,9
Array 2: 9-8-7-6-5-4-3-2-1

_____________________

PART B:

UserNamesPassword.java

import java.util.Scanner;

public class UserNamesPassword {

   public static void main(String[] args) {
   //Declaring variables
       String uname,passwd;
      
       //Creating an String arrays and initializing with values
       String usernames[]={"Bob","Jane","Jill","Sean","Mel"};
       String pwd[]={"jelly","clock","tree","computer","chip"};
      
       //Scanner object is used to get the inputs entered by the user
       Scanner sc=new Scanner(System.in);
      
      
       int count=0;
       boolean bool;
       while(true)
       {

           //Getting the user name and pwd
           System.out.print("Enter the user name :");
           uname=sc.next();
           System.out.print("Enter the user pwd :");
           passwd=sc.next();
          
           //calling the method to check the username and pwd is valid or not
           bool=checkUserNamePwd(uname,passwd,usernames,pwd);
          
       if(bool==false && count==0)
       {
           count++;
           System.out.println("** Invalid.Try again **");
continue;           
       }
       else if(bool==true)
       {
           System.out.println("Login Successful");
           break;
       }
       else
       {
           System.out.println("Sorry your name and does not match our database. Contact the administrator");
           break;
       }
  
       }

}

   //This function will check whether the user name and pwd is valid or not
   private static boolean checkUserNamePwd(String uname, String passwd,
           String[] usernames, String[] pwd) {
       boolean un=false,pw=false;
       int i=0;
       while(i<usernames.length)
       {
           if(uname.equals(usernames[i]))
           {
               un=true;
               break;
           }
           else
           {
               i++;
           }
       }
       i=0;
       while(i<pwd.length)
       {
           if(passwd.equals(pwd[i]))
           {
               pw=true;
               break;
           }
           else
           {
               i++;
           }
       }
       if(un==true && pw==true)
           return true;
       else
           return false;
   }

}

output#1:

Enter the user name :Bob
Enter the user pwd :jel
** Invalid.Try again **
Enter the user name :Bob
Enter the user pwd :jely
Sorry your name and does not match our database.
Contact the administrator

_______________

Output#2:

Enter the user name :Bob
Enter the user pwd :jelly
Login Successful

_______________Thank You

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